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RadWindowInteropHelper
Updated on Sep 15, 2025
The RadWindowInteropHelper helper class assists for the interoperation between Windows Presentation Foundation (WPF) and Win32 code.
Here is a brief list of all attached properties exposed by the class:
- ClipMaskCornerRadius: The CornerRadius used to create a clipping mask on the underlying Window.
- AllowTransparency: Gets or sets the AllowTransparency property of the underlying Window.
- OpaqueWindowBackground: The Brush used to render the Background of the underlying window if AllowTransparency is set to False.
- Title: Gets or sets the Title used to display in the OS for the underlying Window.
- Icon: Gets or sets the ImageSource used to display the Icon in the OS for the underlying Window.
- ShowInTaskbar: Gets or sets the ShowInTaskbar property of the underlying Window.
Example 1 demonstrates how to set each of the properties both in XAML and code-behind while Figure 1 and Figure 2 illustrate the final result.
Example 1: Set RadWindowInteropHelper attached properties
XAML
<telerik:RadWindow x:Class="ProjectNamespace.CustomWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:navigation="clr-namespace:Telerik.Windows.Controls.Navigation;assembly=Telerik.Windows.Controls.Navigation"
navigation:RadWindowInteropHelper.ClipMaskCornerRadius="0"
navigation:RadWindowInteropHelper.AllowTransparency="False"
navigation:RadWindowInteropHelper.OpaqueWindowBackground="Red"
navigation:RadWindowInteropHelper.Title="Custom Window"
navigation:RadWindowInteropHelper.Icon="icon.png"
navigation:RadWindowInteropHelper.ShowInTaskbar="True" >
<Grid>
<!-- ... -->
</Grid>
</telerik:RadWindow>Example 1: Set RadWindowInteropHelper attached properties
C#
RadWindowInteropHelper.SetClipMaskCornerRadius(this, new CornerRadius(0));
RadWindowInteropHelper.SetAllowTransparency(this, false);
RadWindowInteropHelper.SetOpaqueWindowBackground(this, Brushes.Red);
RadWindowInteropHelper.SetTitle(this, "Custom Window");
RadWindowInteropHelper.SetIcon(this, new BitmapImage(new Uri("../../icon.png", UriKind.RelativeOrAbsolute)));
RadWindowInteropHelper.SetShowInTaskbar(this, true);Figure 1: The customized RadWindow
Figure 1: The customized RadWindow's taskbar thumbnail preview
