If many people were working on a task and all on differant views like one person on Dialogs the other person on a graph interface playing with the OnDraw function. If the graph interface has to be brought into the dialog project by not modifying the dialog project and only including the files of the graph task. How do I do it ? Since both use the CMyView class there is bound to be sharing or multiple declaratins problems How do I solv ethis problem. And does the Invalidate function work with a constructor?