internal override void OnAttach(DependencyObject d, DependencyProperty dp)
{
if (IsAttached)
{
return;
}
Debug.Assert(d != null);
Debug.Assert(dp != null);
IsAttached = true;
Target = d;
TargetProperty = dp;
_skipTypeCheck = TargetProperty.PropertyType.IsAssignableFrom(SourceProperty.PropertyType);
_listener = INTERNAL_PropertyStore.ListenToChanged(Source, SourceProperty,
(o, args) => Target.ApplyExpression(TargetProperty, this, false));
}
