public object ParseTemplateBinding (ref string expression)
{
TemplateBindingExpression tb = new TemplateBindingExpression ();
char next;
string prop = GetNextPiece (ref expression, out next);
/*FrameworkTemplate template = */GetParentTemplate ();
tb.TargetPropertyName = attribute_name;
tb.SourcePropertyName = prop;
// tb.Source will be filled in elsewhere between attaching the change handler.
return tb;
}