/// The WM_PAINT message is sent when the system or another application makes a request to paint a portion of an application's window. The message is sent when the UpdateWindow or RedrawWindow function is called, or by the DispatchMessage function when the application obtains a WM_PAINT message by using the GetMessage or PeekMessage function.

                Win32.DispatchMessage( ref msg);

static extern IntPtr DispatchMessage([In] ref MSG lpmsg);

Public Shared Function DispatchMessage( _

            WindowsAPIs.DispatchMessage(ref msg);