///--------------------------------------------------------------------
/// <summary>
/// Finds all automation elements that satisfy 
/// the specified condition(s).
/// </summary>
/// <param name="rootElement">
/// The automation element from which to start searching.
/// </param>
/// <returns>
/// A collection of automation elements satisfying 
/// the specified condition(s).
/// </returns>
///--------------------------------------------------------------------
private AutomationElementCollection FindAutomationElement(
    AutomationElement rootElement)
{
    if (rootElement == null)
    {
        throw new ArgumentException("Root element cannot be null.");
    }

    PropertyCondition conditionCanMaximize = 
        new PropertyCondition(WindowPattern.CanMaximizeProperty, true);

    PropertyCondition conditionCanMinimize =
        new PropertyCondition(WindowPattern.CanMinimizeProperty, true);

    PropertyCondition conditionIsModal =
        new PropertyCondition(WindowPattern.IsModalProperty, false);

    PropertyCondition conditionIsTopmost =
        new PropertyCondition(WindowPattern.IsTopmostProperty, true);

    PropertyCondition conditionWindowInteractionState =
        new PropertyCondition(
        WindowPattern.WindowInteractionStateProperty, 
        WindowInteractionState.ReadyForUserInteraction);

    PropertyCondition conditionWindowVisualState =
        new PropertyCondition(
        WindowPattern.WindowVisualStateProperty, 
        WindowVisualState.Normal);

    // Use any combination of the preceding condtions to 
    // find the control(s) of interest
    Condition condition = new AndCondition(
        conditionCanMaximize, 
        conditionIsModal, 
        conditionWindowInteractionState);

    return rootElement.FindAll(TreeScope.Descendants, condition); 
}