Allow user to resize child windows in OOBA

Is where a standart way to allow user to resize a childwindow (not just the main) in Silverlight OOB app? The only solution i have now is to create a clickable area and handle mouse ev开发者_StackOverflowents there but at that point i have troubles with layout slots (between borders of real window and it's content there is some space). So to create a standart "Resize Edge" i have to play with negative margin values... If there is no standart way maybe there is more pretty decision then the above one?