Child Window and Parent Window

Hi everyone,Can some one tell  How to open child window from parent window MenuStrip
and after opening it should be fit inside Parent Window

the Code is
 
 Private void Button_Click_2(object sender, RoutedEventArgs e)
 {
 ChildWindow cw=new ChildWindow();
 cw.owner=this;
 cw.Show();
 }

 when Child Window opens up.it Should be fit inside parent Window and the menustrip should    be visible

Thanks
Gunnala Hariom Prasad