Greetings, I am not on my development machine at the moment to verify my memory, but I recall having a similar problem when using an MDIWindow as a drop target. When dropped, the widget (a Datagrid in my case) would stubbornly snap to the upper left corner of the MDIWindow. My solution was to place a Canvas inside the MDICanvas, which was inside the MDIWindow. There might be a nicer way to do it, but it worked and I was in a time crunch. In looking at your code, you are making your components, e.g. DataGridView, children of the MDIWindow. Try adding them as children of the Canvas and follow the guidelines above. A quick shout out to the FlexMDI guys. Thanks for the great library!
Regards, RobM
