'trackbar position
'  在跟踪条设置的可用的选择范围的起始和结束位置。
'  hTrackbar : The handle of the track bar. (e.g. HWND_FORM1_SLIDER1)
'  fRedraw   : Redraw flag. If this parameter is TRUE, the message redraws the trackbar 
'              after the selection range is set. If this parameter is FALSE, the message sets the 
'              selection range but does not redraw the trackbar.
'  lMinimum  : Starting logical position for the selection range.
'  lMaximum  : Ending logical position for the selection range
Sub FF_TrackBar_SetSel (ByVal hTrackbar as HWnd, ByVal fRedraw as Long, ByVal lMinimum as Long, ByVal lMaximum as Long)

    SendMessage hTrackbar, TBM_SETSEL, fRedraw, Cast(LPARAM, MAKELONG(lMinimum, lMaximum))

End Sub
