Client Area Functions:

BT_ClientAreaInvalidateAll (Win, lErase)

Force to redraw the all of the client area of the specified window.

Win: is the name (e.g. "Win1") or is the handle (e.g. hWin) of the window.

lErase: specifies whether the background within the update region is to be erased when the update region is processed. If this parameter is TRUE (.T.), the background is erased. If this parameter is FALSE (.F.), the background remains unchanged. For default: lErase = .F.

BT_ClientAreaInvalidateRect (Win, Row, Col, Width, Height, lErase)

Force to redraw the specified rectangle of the client area of the specified window.

Win: is the name (e.g. "Win1") or is the handle (e.g. hWin) of the window.

Row, Col, Width, Height: specifies the dimensions in pixels of the rectangle to redraw. For default: Row = 0, Col = 0, Width = BT_ClientAreaWidth(Win), Height = BT_ClientAreaHeight(Win).

lErase: specifies whether the background within the update region is to be erased when the update region is processed. If this parameter is TRUE (.T.), the background is erased. If this parameter is FALSE (.F.), the background remains unchanged. For default: lErase = .F.