The create returns a zeroįor failure but GetLastError() doesn't return an error. It fails when creating the windows handle for a treeview control I believe. The dialog is shown, it just contains no controls because it short circuits when the control fails to create. When running an application when the Tablet Feature is turned on and the Tablet PC Input service is running, a specific dialog in our app will fail to create I have a Dell Latitude XT2 tablet running Windows 7 64-bit Professional SP1.