Invalidates the region occupied by the current View (adds it to the control's update region which will be repainted during the next paint operation), and causes a paint message to be sent to the scheduler control.
The Invalidate method does not force a synchronous paint. To force a synchronous paint, call the Update method of your scheduler control after calling Invalidate.
A View is automatically invalidated each time it is required. You may find that your application requires specific behaviors to be implemented for a View such as custom painting particular scheduler elements. If so, you may need to force invalidation manually.