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WArrowButton:Paint() Method
Draw/re-draw an arrow button
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Syntax
<oWnd>:Paint()   -->   0

Arguments
None.  However, the protected property self:hDC is a valid
device context.

Returns
Zero (0).

Description
This method draws the button.  It will be called any time the
screen needs updating, such as when the user uncovers part or
all of a window.  It may be called as a result of several
different messages, e.g. WM_DRAWITEM and WM_PAINT.

Example
// See SOURCE\OO\CLASSES\ARROWBTN.PRG