private void cmbLanguage_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     //set current Language
     string selectedValue = (string)cmbLanguage.SelectedValue;
     if (selectedValue == "中文(中华人民共和国)")
     {
         if (Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride != "zh-Hans-CN")
         {
             this.currentLanguage = "zh-Hans-CN";
             this.txtLanguageTip.Visibility = Visibility.Visible;
             this.btnClose.Visibility = Visibility.Visible;
         }
         else
         {
             this.txtLanguageTip.Visibility = Visibility.Collapsed;
             this.btnClose.Visibility = Visibility.Collapsed;
         }
     }
     else
     {
         if (Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride != "en-US")
         {
             this.currentLanguage = "en-US";
             this.txtLanguageTip.Visibility = Visibility.Visible;
             this.btnClose.Visibility = Visibility.Visible;
         }
         else
         {
             this.txtLanguageTip.Visibility = Visibility.Collapsed;
             this.btnClose.Visibility = Visibility.Collapsed;
         }
     }
 }

        private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
             string item = listBox.SelectedItem.ToString();
            if  (item.Equals("Do I have to register to avail the services?"))
            {
               await new MessageDialog("Yes, you must register to avail our services. This would help you to store your information with us and you do not have to enter your details everytime you use this app.").ShowAsync();

            }

            else if (item.Equals("Are there any registration charges for creating an account?"))
            {
                await new MessageDialog("No, there are no registration charges applicable for creating an account with us. It is absolutely free of cost.").ShowAsync();
            }
            else if (item.Equals("What should I do if I have trouble with logging in?"))

            {
                await new MessageDialog("Follow these instructions if you face an issue logging in: Check your login details. Make sure your username and password should match with the signup credentials. If you have forgotten your password, reset your password using the ‘Forgot your Password’ link on the sign-in page. If you are still unable to access your account, please contact us. We will resolve the issue at the earliest.").ShowAsync();
            }
            else if (item.Equals("Should I be concerned with the privacy of my personal details I have shared with the app?"))
            {
                await new MessageDialog("Do not worry! We are absolutely committed to safeguarding your personal information. The personal information collected is to validate your identity, as well as to provide us with a way to get in touch with you if the need should arise. We follow strict security procedures in the storage and disclosure of information which you have given us, to prevent unauthorised access. We do not pass on, trade or sell your personal information to anyone.").ShowAsync();
            }
            else if (item.Equals("What if I have additional questions?"))
            {
               await new MessageDialog("If you have any additional questions, comments or other general customer service inquiries, please submit your query using contact us link. We will resolve the issue at the earliest.").ShowAsync();
            }

            else
            {

            }
        }

        /// <summary>
        /// Invoked when a filter is selected using the ComboBox in snapped view state.
        /// </summary>
        /// <param name="sender">The ComboBox instance.</param>
        /// <param name="e">Event data describing how the selected filter was changed.</param>
        void Filter_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Determine what filter was selected
            var selectedFilter = e.AddedItems.FirstOrDefault() as Filter;
            if (selectedFilter != null)
            {
                // Mirror the results into the corresponding Filter object to allow the
                // RadioButton representation used when not snapped to reflect the change
                selectedFilter.Active = true;

                // TODO: Respond to the change in active filter by setting this.DefaultViewModel["Results"]
                //       to a collection of items with bindable Image, Title, Subtitle, and Description properties

                // Ensure results are found
                object results;
                ICollection resultsCollection;
                if (this.DefaultViewModel.TryGetValue("Results", out results) &&
                    (resultsCollection = results as ICollection) != null &&
                    resultsCollection.Count != 0)
                {
                    VisualStateManager.GoToState(this, "ResultsFound", true);
                    return;
                }
            }

            // Display informational text when there are no search results.
            VisualStateManager.GoToState(this, "NoResultsFound", true);
        }

        /// <summary>
        /// Invoked when a filter is selected using the ComboBox in snapped view state.
        /// </summary>
        /// <param name="sender">The ComboBox instance.</param>
        /// <param name="e">Event data describing how the selected filter was changed.</param>
        async void Filter_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Determine what filter was selected
            var selectedFilter = e.AddedItems.FirstOrDefault() as Filter;
            if (selectedFilter != null)
            {
                // Mirror the results into the corresponding Filter object to allow the
                // RadioButton representation used when not snapped to reflect the change
                selectedFilter.Active = true;

                ElementsDataSource model = new ElementsDataSource();
                await model.LoadElements();
                var elements = model.Elements.Where(t => t.Name.ToLower().Contains(((string)this.DefaultViewModel["QueryText"]).ToLower())).AsEnumerable();
                this.DefaultViewModel["Results"] = elements;

                selectedFilter.Count = elements.Count();

                // Ensure results are found
                object results;
                if (this.DefaultViewModel.TryGetValue("Results", out results) && elements.Count() > 0)
                {
                    VisualStateManager.GoToState(this, "ResultsFound", true);
                    return;
                }
            }

            // Display informational text when there are no search results.
            VisualStateManager.GoToState(this, "NoResultsFound", true);
        }

 void itemListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (this.UsingLogicalPageNavigation())
     {
         this.navigationHelper.GoBackCommand.RaiseCanExecuteChanged();
     }
 }

 private void menuItems_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if(Home.IsSelected)
             Frame.Navigate(typeof(MainPage));
      else
         Frame.Navigate(typeof(MainPage));
 }

 private void NavMenu_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     var listBox = (ListBox)sender;
     if (listBox.SelectedIndex == -1) return;
     NavStrip.IsPaneOpen = false;
     ContentFrame.Navigate(((NavItem)listBox.SelectedItem).Page);
 }

 private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     var selectedId = (sender as ListBox).SelectedIndex;
     Problems clickedProblem = (Problems)listofitems[selectedId];
     var navCont = new CodeEditorContext(clickedProblem, "Problems");
     Frame.Navigate(typeof(CodeEditor), navCont);
 }

        private async void gvMain_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (e != null && e.AddedItems != null && e.AddedItems.Count > 0)
            {
                var item  = (Photo)e.AddedItems[0];

                //DOWNLOAD ACTUAL IMAGE INTO PICTURES LIBRARY
                await DownloadService.Current.Downloader("1", item.MediumUrl, string.Empty, item.PhotoId + "_" + item.Secret, 2, storageFolder: "ModernCSApp");


                //UPDATE D2D BACKGROUND WITH DOWNLOADED IMAGE
                var br = RenderingService.BackgroundRenderer;
                string[] partsUrl = item.MediumUrl.Split(".".ToCharArray());
                br.ChangeBackground("ModernCSApp\\" + item.PhotoId + "_" + item.Secret + "." + partsUrl[partsUrl.Length - 1], "PicturesLibrary");


                ////REQUEST TO MINIMIZE THIS LIST IN ITS PARENT
                //if (ChangeViewState != null)
                //{
                //    this._currentViewState = "Minimized";
                //    grdTitle.Opacity = 0.5;
                //    ChangeViewState("Minimized", EventArgs.Empty);
                //}

                //TELL PARENT PICTURE HAS CHANGED
                if (PictureChanged != null)
                {
                    PictureChanged(Serialize(item), EventArgs.Empty);
                }

                ////DISABLE THE LIST TILL ITS NORMAL/MAXIMIZED
                //gvMain.IsEnabled = false;

            }
        }

        void cboxDebug_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //graph.VertexList.Values.ForEach(a => a.VertexConnectionPointsList.ForEach(b => b.Hide()));
            graph.ClearLayout();
            graph.LogicCore.Graph.Clear();
            graph.LogicCore.EnableParallelEdges = false;
            graph.LogicCore.ParallelEdgeDistance = 25;
            graph.LogicCore.EdgeCurvingEnabled = false;

            graph.SetVerticesDrag(true, true);
            graph.SetVerticesMathShape(VertexShape.Circle);
            graph.ShowAllVerticesLabels(false);
            graph.ShowAllEdgesLabels(false);
            graph.AlignAllEdgesLabels(false);

            switch ((DebugItems)cboxDebug.SelectedItem)
            {
                case DebugItems.General:
                    DebugGeneral();
                    break;
                case DebugItems.EdgeLabels:
                    DebugEdgeLabels();
                    break;
                case DebugItems.VCP:
                    DebugVCP();
                    break;
            }

        }

 private void ListMenuItems_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     ListView a = sender as ListView;
     string b = a.SelectedItem as string;
     if (b[0] == 'C')
     {
         Frame.Navigate(typeof(Compare));
     }
     if (b[0] == 'L')
     {
         Frame.Navigate(typeof(ResultPage));
     }
     if (b[0] == 'e')
     {
         Frame.Navigate(typeof(ex_Result));
     }
     if (b[0] == 'M')
     {
         Frame.Navigate(typeof(Aukat));
     }
     if (b[0] == 'A')
     {
         Frame.Navigate(typeof(About));
     }
     if (b[0] == 'F')
     {
         Frame.Navigate(typeof(Feedback));
     }
 }  

        private void IntervalBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedItem = (ComboBoxItem)e.AddedItems.First();
            uint timeInterval = 0;

            switch (selectedItem.Name)
            {
                case "IntervalNever":
                    timeInterval = 0;
                    break;
                case "Interval30":
                    timeInterval = 30;
                    break;
                case "Interval60":
                    timeInterval = 60;
                    break;
                case "Interval90":
                    timeInterval = 90;
                    break;
                case "Interval2h":
                    timeInterval = 120;
                    break;
                case "Interval6h":
                    timeInterval = 360;
                    break;
                case "IntervalOnce":
                    timeInterval = 720;
                    break;
            }

            BackgroundHelper.RegisterBackgroundTask(timeInterval);
            ApplicationData.Current.LocalSettings.Values["currentInterval"] = timeInterval;
        }

 private void Selector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (e.AddedItems.Count == 1)
     {
         HomeViewModel.SwitchRoomCommand.Execute(e.AddedItems[0]);
     }
 }

        private void flipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            int prevMinIndex = minIndex;
            int prevMaxIndex = maxIndex;
            minIndex = Math.Max(0, flipView.SelectedIndex - 30);
            maxIndex = Math.Min(flipView.Items.Count - 1, flipView.SelectedIndex + 30);

            if (maxIndex > prevMaxIndex)
            {
                AddImageToMemory(maxIndex);
            }
            else if (maxIndex < prevMinIndex)
            {
                RemoveImageFromMemory(maxIndex);
            }
            if (minIndex < prevMinIndex)
            {
                AddImageToMemory(minIndex);
            }
            else if (minIndex > prevMinIndex)
            {
                RemoveImageFromMemory(minIndex);
            }

            dateText.Text = ((Photo)(flipView.SelectedItem)).Date.ToString();
        }

 private void ComboSize_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     switch (ComboSize.SelectedIndex)
     {
         case 0:
             settings.m_uXnum = 10;
             settings.m_uYnum = 10;
             settings.m_uMineNum = 8;
             break;
         case 1:
             settings.m_uXnum = 16;
             settings.m_uYnum = 16;
             settings.m_uMineNum = 40;
             break;
         case 2:
             settings.m_uXnum = 20;
             settings.m_uYnum = 20;
             settings.m_uMineNum = 80;
             break;
         case 3:
             settings.m_uXnum = 0;
             settings.m_uYnum = 0;
             settings.m_uMineNum = 0;
             break;
     }
 }

        private void AnimationComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (this.AnimationCombo == null)
                return;

            fadeTile.AnimationType = (ImageTileAnimationTypes)Enum.Parse(typeof(ImageTileAnimationTypes), (string)(this.AnimationCombo.SelectedItem as ComboBoxItem).Content);
        }

 private void FlipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if ((sender as FlipView).SelectedItem != null)
     {
         this.eventTitle.Text = ((sender as FlipView).SelectedItem as EventItemViewModel).Title;
     }
 }

 private void Characteristics_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (e.AddedItems.Count != 0)
     {
         viewmodel.GetDescriptors("");
     }
 }

        private async void lbPictures_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (e != null &&  e.AddedItems.Count > 0)
            {
                var ili = e.AddedItems[0] as ImageListItem;

                ImageUri = $"x-ext://{ili.AppExtensionId}/{ili.File}";

                ImageChanged?.Invoke(sender, new ImagePickerEventArgs() {
                    Text = ImageUri,
                    AppExtensionId = ili.AppExtensionId,
                    File = ili.File });

                

                //set imagesource
                var el = ExtensionsService.Instance.FindExtensionLiteInstance(ili.AppExtensionId);
                var packageDirectory = el.AppExtension.Package.InstalledLocation;
                var publicDirectory = await packageDirectory.GetFolderAsync("public");
                var ImageFile = await publicDirectory.GetFileAsync(ili.File);
                var bitmapImage = new BitmapImage();
                using (var stream = await ImageFile.OpenReadAsync())
                {
                    await bitmapImage.SetSourceAsync(stream);
                }
                ImageSource = bitmapImage;
            }
        }

 private void Services_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (e.AddedItems.Count != 0)
     {
         viewmodel.GetSelectedServicesCharacteristics("");
     }
 }