protected override void OnPreviewGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnPreviewGotKeyboardFocus(e);
if (this.AutoSelectBehavior == AutoSelectBehavior.OnFocus)
{
// If the focus was not in one of our child ( or popup ), we select all the text.
if (!TreeHelper.IsDescendantOf(e.OldFocus as DependencyObject, this))
{
this.SelectAll();
}
}
}
public static bool IsDescendantOf(DependencyObject element, DependencyObject parent)
{
return(TreeHelper.IsDescendantOf(element, parent, true));
}