private void PreviewEscapeTabKeyDown(KeyEventArgs e)
{
Popup.IsOpen = false;
SearchTextBoxControl.Clear();
if (e.Key == Key.Tab)
{
Frame parent = GlobalUtils.FindVisualParent <Frame>(this);
Selector child = GlobalUtils.FindVisualChildren <Selector>(parent).FirstOrDefault();
if (child != null)
{
parent.Focusable = true;
child.Focus();
parent.Focusable = false;
}
}
}