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 METHOD Update CLASS TWindow
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Syntax:
   TWindow:Update()  -->

Purpose:
The Update() method will call the refresh() method of each control that is associated
with the window if the instance variable ::lUpdate of the control is .T.. This
allows you to update all the controls (for which the ::lUpdate instance variable is
.T. ) on a particular window with just one call. The ::lUpdate instance variable is
normally set whenever you use the keyword UPDATE when defining/redefining a control.