In the following sample, please press the down arrow till the thumb reaches about half the scrollbar and then try to press PAGE DOWN. You will see that the thumb itself moves up instead of down:
EMG
#include "Fivewin.ch"
#include "Tcbrowse.ch"
FUNCTION MAIN()
LOCAL oDlg, oBrw
USE TEST
DEFINE DIALOG oDlg;
SIZE 400, 400
@ 0, 0 BROWSE oBrw
ADD COLUMN TO oBrw;
DATA TEST -> last;
HEADER "LAST"
ADD COLUMN TO oBrw;
DATA TEST -> first;
HEADER "FIRST"
ACTIVATE DIALOG oDlg;
ON INIT oDlg:SetControl( oBrw );
CENTER
CLOSE
RETURN NILEMG