Merge pull request #2829 from telerik/new-kb-kb-docking-invalidoperat…

…ionexception-input-bindings-11ad6da4d2b343fba04661649330ed9b Added new kb article kb-docking-invalidoperationexception-input-bindings
telerik · Feb 28, 2024 · ae171c0 · ae171c0
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+---
+title: Calling thread cannot access this object when opening RadDocking on another UI thread
+type: how-to
+page_title: InvalidOperationException is thrown when showing Docking on separate thread.
+description: "The calling thread cannot access this object because a different thread owns it, when RadDocking is started on a new UI thread."
+slug: kb-docking-invalidoperationexception-input-bindings
+tags: raddocking, multiple-threads, exception, thread
+res_type: kb
+---
+
+# Environment
+| Product | RadDocking for WPF |
+| ------- | ----------------- |
+| Version | 2019.2.618       |
+
+## Description
+
+`InvalidOperationException` is thrown when `RadDocking` is hosted in a window that can be opened on separate UI threads. 
+
+The exception message is: *"The calling thread cannot access this object because a different thread owns it."*
+
+## Solution
+
+This happens because of a `MouseBinding` defined in the `InputBindings` collection of one of the `RadDocking` visuals (the `PaneHeader` element).
+
+To avoid the issue, you can add a new `Style` for the `PaneHeader` element in the Resources of the window that opens on the new UI thread.
+
+#### __[XAML]__
+{{region kb-docking-invalidoperationexception-input-bindings-0}}
+	<UserControl.Resources>
+		<!--If you use NoXaml dlls please add BasedOn="{StaticResource PaneHeaderStyle}" to the Style object. For example: -->
+		<!--<Style TargetType="telerik:PaneHeader" BasedOn="{StaticResource PaneHeaderStyle}" >-->
+		<Style TargetType="telerik:PaneHeader">
+			<Setter Property="telerik:InputBindingsManager.InputBindings">
+				<Setter.Value>
+					<InputBindingCollection>
+						<MouseBinding Command="telerikDocking:RadDockingCommands.PaneHeaderMenuOpen">
+							<MouseBinding.Gesture>
+								<MouseGesture MouseAction="RightClick" />
+							</MouseBinding.Gesture>
+						</MouseBinding>
+					</InputBindingCollection>
+				</Setter.Value>
+			</Setter>
+		</Style>
+	</UserControl.Resources>
+{{endregion}}
+
+In some cases, you may need to merge this `Style` in the `Resources` of the opened `ToolWindow`. To do this, you can use the `ToolWindowCreated` event of `RadDocking`, where you can access the `Resources` of the window in code-behind.
+