YesNo MessageBox not closing when x-button clicked

Question

When I open a MessageBox with options YesNo, the (usually) cancelling cross in the upper right is shown but has no effect.

System.Windows.MessageBox.Show(\"R         


        

Answer 1

When you delete files in explorer (when delete confirmation is checked in recycle bin properties), a message box appears and asks "Are you sure you want to move these x items to recycle bin?" with a caption "Delete confirmation" and X at right corner. Escape also works. Buttons available are "yes" and "no" only. How can we get this done?

Either Microsoft is not following their on guidelines or not making this available for the developer.