Method XbpListBox():setTopItem() Foundation
Sets the first item visible at the top of the list box.
:setTopItem( <nPos> ) --> lSuccess
This method returns the value .T. (true) when the first item visible in the list box could be set, otherwise it returns .F. (false).
The :setTopItem() method allows the first item in the display window of the XbpListbox object to be defined. This is used to explicitly scroll the list.
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