private static void SetEventIfItsNotSet(DependencyObject obj)
{
if ((bool)obj.GetValue(IsEventSetProperty))
{
return;
}
FocusManager.AddLostFocusHandler(obj, (sender, e) =>
{
((DependencyObject)sender).SetValue(HasFocusProperty, false);
});
obj.SetValue(IsEventSetProperty, true);
}
