When we are debugging in visual studio 2010 the components are not drawing at the diagram.
By example, i have a breakpoint to observe a comportament when i’m dropping a element from a palette to a a diagram. When press F5 the component are not in the diagram, but if we are not debugging, the element appears here.
My guess is that during debugging the drag-and-drop is being interrupted, with the position of the mouse changing and with the mouse no longer being “over” the target diagram.
Debugging drag-and-drop can be tricky. I’m not sure I have any good suggestions for how to do it, since it depends on exactly what you are trying to debug.
I suppose the only general advice I can think of would be to add more tracing statements.