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RadComboBox drop-down list loses focus when hosted in Silverlight 5 native windows

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This is a migrated thread and some comments may be shown as answers.
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I asked on 03 Feb 2012, 12:58 PM

The current implementation of Telerik’s RadComboBox has a focus issue on the drop-down list when hosted in a Silverlight 5 native/secondary window (in OOB applications). When you try to move the mouse down to select the drop-down list items the popup containing the items disappears (it works fine with keyboard).

Silverlight 5 provides a new overload of the FocusManager.GetFocusedElement method that takes the required window as a parameter:

This must be called to find the focused element in the correct window, otherwise by default it returns the focused element of the main window.

Fix to Telerik’s RadComboBox control:

Solution: Input_SL
Project: Input_SL
File: ComboBox/RadComboBox.cs
Method: IsFocusWithin

private bool IsFocusWithin
       {    // Start fix
            var element = Window.GetWindow(this) as DependencyObject;
            FrameworkElement focusedElement =
               element == null
               ? this.GetFocusedElement() as FrameworkElement
               : FocusManager.GetFocusedElement(element) as FrameworkElement;                                    
            // End fix
            if (focusedElement != null)
                   focusedElement == this ||
                   this.IsAncestorOf(focusedElement) ||
                  (this.dropDownPopup != null && 
                   this.dropDownPopup.IsOpen && 
                   this.dropDownPopup.Child != null && 
                   (this.dropDownPopup.Child as FrameworkElement).IsAncestorOf(focusedElement)
            return false;

Note: this is not an issue when using Microsoft's Silverlight 5 ComboBox implementation

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Valeri Hristov
Telerik team
answered on 03 Feb 2012, 02:55 PM

Thank you for your feedback. This is a known problem that will be resolved with the Q1 2012 release, due in a couple of weeks. I am afraid that the fix will not be available in the upcoming final internal build for Q3 2011.

All the best,
Valeri Hristov
the Telerik team

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Valeri Hristov
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