title: Enable Tab Stop for TextBox in a UserControl exists in StackPanel
body: <p>I have a user control that consists of a CheckBox and a TextBox. I create instances of this user control dynamically at runtime according to properties of my object and add them into a StackPanel.</p>
  
  <p>I would like to enable Tab navigation between these TextBoxes. Setting IsTabStop="True" for the TextBox in the user control did not worked. I have also set KeyboardNavigation.TabNavigation="Contained" for TextBox but not succeeded.</p>