#include <Constants.au3>
#include <GUIScrollBars_Ex.au3>

$hGUI = GUICreate("anything", 600, 400)

$top = 5

For $i = 1 to 50

GUICtrlCreateLabel("anything", 5, $top, 200, 15)
GUICtrlSetBkColor(-1, $COLOR_BLUE)
$top = $top + 20
Next

_GUIScrollbars_Generate($hGUI, 0, 1200)
GUISetState(@SW_SHOW, $hGUI)

While 1
    $msg = GUIGetMsg()
    Switch $msg
        Case $GUI_EVENT_CLOSE
            Exit
    EndSwitch
Wend

; I would like to limit down scrolling to the bottom edge of the last GUICtrlCreateLabel (without empty space).
; Which calculation method should I use to calculate the _GUIScrollbars_Generate's ScrollHeight?
; Thanks in advance for help!