How can I, in WPF, create an ability to drag a marker onto another window? If I can use the standard drag and drop, then I need a way to handle an event when the drag is completed. (No actual data will be copied, the drag and drop would actually fail in terms of standard usage, but at the ending point I would use a library to record the mouse's position and other information, which is all I need.) If that isn't possible, then how can I intercept mouse events once the mouse has left the window to know when the user has released the button?