How to resolve an issue where WPF UserControl is not releasing focus?

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I have a WPF user control whose XAML is given here. When I put it on some other WPF window and TAB into this control while tabbing on the window, somehow this control does not lose focus. Focus comes on the "Search" button and stays there only.

How to resolve this problem? Why is it not releasing focus? UPDATE: When I add KeyboardNavigation.

TabNavigation="Once" to the UserControl element, the focus goes out of the control. BUT when I TAB from text box, it directly goes out instead of setting focus on the Search button. So this is certainly not expected behavior for me.

Wpf wpf-controls wpf-usercontrols link|improve this question edited Oct 19 '11 at 8:56 asked Oct 19 '11 at 7:58CSharpLearner620110 77% accept rate.

– AngelWPF Oct 19 '11 at 8:11 The user control is placed on the window where there is no other user control. But other WPF controls which are present on the window are focusable. – CSharpLearner Oct 19 '11 at 8:27.

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