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WindowPattern.WindowPatternInformation.IsTopmost Property

Gets a value that specifies whether the AutomationElement is the topmost element in the z-order.

Namespace:  System.Windows.Automation
Assembly:  UIAutomationClient (in UIAutomationClient.dll)

public bool IsTopmost { get; }

Property Value

Type: System.Boolean
true if the AutomationElement is topmost; otherwise false.

In the following example, an AutomationPropertyChangedEventHandler is defined to listen for changes to the IsTopmostProperty of an AutomationElement.

/// <summary> 
/// Register for automation property change events of interest. 
/// </summary> 
/// <param name="targetControl">
/// The automation element of interest. 
/// </param> 
private void RegisterForPropertyChangedEvents(
    AutomationElement targetControl)
    AutomationPropertyChangedEventHandler propertyChangeListener = 
        new AutomationPropertyChangedEventHandler(


/// <summary> 
/// Register for automation property change events of interest. 
/// </summary> 
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnTopmostPropertyChange(object src, AutomationPropertyChangedEventArgs e)
    // Make sure the element still exists. Elements such as tooltips 
    // can disappear before the event is processed.
    AutomationElement sourceElement;
        sourceElement = src as AutomationElement;
    catch (ElementNotAvailableException)

    // Get a WindowPattern from the source of the event.
    WindowPattern windowPattern = GetWindowPattern(sourceElement);
    if (windowPattern.Current.IsTopmost)
        //TODO: event handling

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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