The Refresh method forces the control to redraw the virtual
display. Normally, the virtual display is automatically redrawn after
the display has been modified and there are no other events being
processed. However, there may be situations where you want the
display updated immediately.
To prevent the control from automatically redrawing when the
virtual display has been modified, set the AutoRefresh
property to False. You can then call the Refresh method to
force the control to be redrawn as needed.