As business applications get built there is usually a need to implement a modal popup to prompt the user for input that is needed before the application can continue. In earlier versions of Silverlight the developer had to roll their own version. In Silverlight 3 the ChildWindow class is used to provide the base functionality needed in a modal popup. This blog will show you how easy the ChildWindow class is to use to implement a simple modal popup function in your application. The finished code for...