there is a design panel like XAML designer that i added some Controls on it(in run-time with create instance of some element and add it to RootLayout.Children). now i like manipulate some properties of one control(that i now which one) with something like this.

(source: persiangig.com)
is there a any short approach to goal?
A quick search for +
PropertyGrid+Silverlight suggests things like this or this.