/// <summary>
        /// Initializes a new instance of the <see cref="ScrollControl"/> class.
        /// </summary>
        /// <param name="parent">Parent control.</param>
        public ScrollControl(ZGE.Components.ZComponent parent)
            : base(parent)
        {
            MouseInputEnabled = true;

            m_VerticalScrollBar = new VerticalScrollBar(this);
            m_VerticalScrollBar.Dock = Pos.Right;
            m_VerticalScrollBar.BarMoved += VBarMoved;
            m_CanScrollV = true;
            m_VerticalScrollBar.NudgeAmount = 30;

            m_HorizontalScrollBar = new HorizontalScrollBar(this);
            m_HorizontalScrollBar.Dock = Pos.Bottom;
            m_HorizontalScrollBar.BarMoved += HBarMoved;
            m_CanScrollH = true;
            m_HorizontalScrollBar.NudgeAmount = 30;

            m_InnerPanel = new GUIControl(this);
            m_InnerPanel.SetPosition(0, 0);
            m_InnerPanel.Margin = Margin.Five;
            m_InnerPanel.SendToBack();
            m_InnerPanel.MouseInputEnabled = false;

            m_AutoHideBars = false;
        }

 public static void Add(GUIControl control, Animation animation)
 {
     animation.m_Control = control;
     if (!m_Animations.ContainsKey(control))
         m_Animations[control] = new List<Animation>();
     m_Animations[control].Add(animation);
 }

        /// <summary>
        /// Centers the control vertically inside its parent.
        /// </summary>
        /// <param name="control"></param>
        public static void CenterVertically(GUIControl control)
        {
            GUIControl parent = control.ParentControl;
            if (null == parent) return;

            control.SetPosition(control.X, (parent.Height - control.Height) / 2);
        }

        /// <summary>
        /// Enables tooltip display for the specified control.
        /// </summary>
        /// <param name="control">Target control.</param>
        public static void Enable(GUIControl control)
        {
            if (null == control.ToolTip)
                return;

            g_ToolTip = control;
        }

 /// <summary>
 /// Disables tooltip display for the specified control.
 /// </summary>
 /// <param name="control">Target control.</param>
 public static void Disable(GUIControl control)
 {
     if (g_ToolTip == control)
     {
         g_ToolTip = null;
     }
 }

        /// <summary>
        /// Moves the control to the left of its parent.
        /// </summary>
        /// <param name="control"></param>
        public static void AlignLeft(GUIControl control)
        {
            GUIControl parent = control.ParentControl;
            if (null == parent) return;

            control.SetPosition(parent.Padding.Left, control.Y);
        }

 public static void Cancel(GUIControl control)
 {
     if (m_Animations.ContainsKey(control))
     {
         m_Animations[control].Clear();
         m_Animations.Remove(control);
     }
 }

 /// <summary>
 /// Initializes a new instance of the <see cref="RadioButtonGroup"/> class.
 /// </summary>
 /// <param name="parent">Parent control.</param>
 /// <param name="label">Label for the outlining GroupBox.</param>
 public RadioButtonGroup(GUIControl parent, String label)
     : base(parent)
 {
     IsTabable = false;
     KeyboardInputEnabled = true;
     Text = label;
     AutoSizeToContents = true;
 }

        /// <summary>
        /// Centers the control horizontally inside its parent.
        /// </summary>
        /// <param name="control"></param>
        public static void CenterHorizontally(GUIControl control)
        {
            GUIControl parent = control.ParentControl;
            if (null == parent) return;


            control.SetPosition(parent.Padding.Left + (((parent.Width - parent.Padding.Left - parent.Padding.Right) - control.Width) / 2), control.Y);
        }

        /// <summary>
        /// Moves the control to the right of its parent.
        /// </summary>
        /// <param name="control"></param>
        public static void AlignRight(GUIControl control)
        {
            GUIControl parent = control.ParentControl;
            if (null == parent) return;


            control.SetPosition(parent.Width - control.Width - parent.Padding.Right, control.Y);
        }

        void OpenMsgbox(GUIControl control)
        {
            MessageBox window = new MessageBox(GetCanvas(), 
                String.Format("Window {0}   MessageBox window = new MessageBox(GetCanvas(), String.Format(  MessageBox window = new MessageBox(GetCanvas(), String.Format(", m_WindowCount), "");
            window.SetPosition(rand.Next(700), rand.Next(400));

            m_WindowCount++;
        }

 /// <summary>
 /// Centers the control inside its parent.
 /// </summary>
 /// <param name="control">Control to center.</param>
 public static void Center(GUIControl control)
 {
     GUIControl parent = control.ParentControl;
     if (parent == null) 
         return;
     control.SetPosition(
         parent.Padding.Left + (((parent.Width - parent.Padding.Left - parent.Padding.Right) - control.Width)/2),
         (parent.Height - control.Height)/2);
 }

 void ColorChanged(GUIControl control)
 {
     IColorPicker picker = control as IColorPicker;
     Color c = picker.SelectedColor;
     HSV hsv = c.ToHSV();
     String text = String.Format("Color changed: RGB: {0:X2}{1:X2}{2:X2} HSV: {3:F1} {4:F2} {5:F2}",
                                 c.R, c.G, c.B, hsv.h, hsv.s, hsv.v);
     UnitPrint(text);
 }

        void OpenWindow(GUIControl control)
        {
            Control.WindowControl window = new Control.WindowControl(GetCanvas(),"",false);
            window.Caption = String.Format("Window {0}", m_WindowCount);
            window.SetSize(rand.Next(200, 400), rand.Next(200, 400));
            window.SetPosition(rand.Next(700), rand.Next(400));

            m_WindowCount++;
        }

        private static void UpdateHoveredControl(GUIControl control, int x, int y)
        {
            //
            // We use this global variable to represent our hovered control
            // That way, if the new hovered control gets deleted in one of the
            // Hover callbacks, we won't be left with a hanging pointer.
            // This isn't ideal - but it's minimal.
            //
            m_NewHoveredControl = control;

            // Nothing to change..
            if (HoveredControl == m_NewHoveredControl)
                return;

            // We changed - tell the old hovered control that it's no longer hovered.
            if (HoveredControl != null && HoveredControl != m_NewHoveredControl)
                HoveredControl.DragAndDrop_HoverLeave(CurrentPackage);

            // If we're hovering where the control came from, just forget it.
            // By changing it to null here we're not going to show any error cursors
            // it will just do nothing if you drop it.
            if (m_NewHoveredControl == SourceControl)
                m_NewHoveredControl = null;

            // Check to see if the new potential control can accept this type of package.
            // If not, ignore it and show an error cursor.
            while (m_NewHoveredControl != null && !m_NewHoveredControl.DragAndDrop_CanAcceptPackage(CurrentPackage))
            {
                // We can't drop on this control, so lets try to drop
                // onto its parent..
                m_NewHoveredControl = m_NewHoveredControl.ParentControl;

                // Its parents are dead. We can't drop it here.
                // Show the NO WAY cursor.
                if (m_NewHoveredControl == null)
                {
                    Platform.Neutral.SetCursor(Cursors.No);
                }
            }

            // Become out new hovered control
            HoveredControl = m_NewHoveredControl;

            // If we exist, tell us that we've started hovering.
            if (HoveredControl != null)
            {
                HoveredControl.DragAndDrop_HoverEnter(CurrentPackage, x, y);
            }

            m_NewHoveredControl = null;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="PropertyRow"/> class.
        /// </summary>
        /// <param name="parent">Parent control.</param>
        /// <param name="prop">Property control associated with this row.</param>
        public PropertyRow(GUIControl parent, Property.PropertyBase prop)
            : base(parent)
        {
            PropertyRowLabel label = new PropertyRowLabel(this);
            label.Dock = Pos.Left;
            label.Alignment = Pos.Left | Pos.Top;
            label.Margin = new Margin(2, 2, 0, 0);
            m_Label = label;

            m_Property = prop;
            m_Property.ParentControl = this;
            m_Property.Dock = Pos.Fill;
            m_Property.ValueChanged += OnValueChanged;
        }

        /// <summary>
        /// Handler for CheckChanged event.
        /// </summary>
        protected virtual void OnCheckChanged(GUIControl control)
        {
            if (m_CheckBox.IsChecked)
            {
                if (Checked != null)
                    Checked.Invoke(this);
            }
            else
            {
                if (UnChecked != null)
                    UnChecked.Invoke(this);
            }

            if (CheckChanged != null)
                CheckChanged.Invoke(this);
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="GroupBox"/> class.
        /// </summary>
        /// <param name="parent">Parent control.</param>
        public GroupBox(ZGE.Components.ZComponent parent)
            : base(parent)
        {
            // Set to true, because it's likely that our  
            // children will want mouse input, and they
            // can't get it without us..
            MouseInputEnabled = true;
            KeyboardInputEnabled = true;

            TextPadding = new Padding(10, 0, 10, 0);
            Alignment = Pos.Top | Pos.Left;
            Invalidate();

            m_InnerPanel = new GUIControl(this);
            m_InnerPanel.Dock = Pos.Fill;
            m_InnerPanel.Margin = new Margin(5, TextHeight+5, 5, 5);
            //Margin = new Margin(5, 5, 5, 5);
        }

        /// <summary>
        /// Handler for Selected event.
        /// </summary>
        /// <param name="control">Event source.</param>
        protected virtual void OnSelected(GUIControl control)
        {
            CategoryButton child = control as CategoryButton;
            if (child == null) return;

            if (m_List != null)
            {
                m_List.UnselectAll();
            }
            else
            {
                UnselectAll();
            }

            child.ToggleState = true;

            if (Selected != null)
                Selected.Invoke(this);
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="MessageBox"/> class.
        /// </summary>
        /// <param name="parent">Parent control.</param>
        /// <param name="text">Message to display.</param>
        /// <param name="caption">Window caption.</param>
        public MessageBox(GUIControl parent, String text, String caption) 
            : base(parent, caption, true)
        {
            DeleteOnClose = true;

            m_Label = new Label(m_InnerPanel);
            m_Label.Text = text;
            m_Label.Margin = Margin.Five;
            m_Label.Dock = Pos.Top;
            m_Label.Alignment = Pos.Center;
            m_Label.AutoSizeToContents = true;

            m_Button = new Button(m_InnerPanel);
            m_Button.Text = "OK"; // todo: parametrize buttons
            m_Button.Clicked += CloseButtonPressed;
            m_Button.Clicked += DismissedHandler;
            m_Button.Margin = Margin.Five;
            m_Button.SetSize(50, 20);

            Align.Center(this);
        }