Home / Community & Support / Developer Productivity Tools Forums / Silverlight > ComboBox > RadComboBox drop-down list loses focus when hosted in Silverlight 5 native windows

• I

  Posted on Feb 3, 2012 (permalink)

  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: http://msdn.microsoft.com/en-us/library/ms604088(v=vs.95).aspx

  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

  {

            get

         {    // 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)

              {

                return

                     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

  Reply

• Answer Valeri Hristov Valeri Hristov

  Posted on Feb 3, 2012 (permalink)

  Hello,
  
  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

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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