I want to create a new event for ChildWindow OnWidthChanged how do i do it in Silverlight?

I want to create a new ev开发者_C百科ent for Silverlight ChildWindow where when the width changes the event must be raised how do i do it in C#/Silverlight?

Listen to the existing SizeChanged event Compare NewSize and PreviousSize in SizeChangedEventArgs to check if width has changed.