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This is not a working example -- I'm asking about the principle... Here we have the often seen code to detect a double-click on an item in one ListBox (ID in $idListBox is of course created by other code). To catch that ListBox item, I have only added $sBookmark to it. This could be a pick list application. $idListBox = 0x004A0FB0 GUIRegisterMsg($WM_COMMAND, "_WM_COMMAND") Func _WM_COMMAND($hWnd, $iMsg, $wParam, $lParam) #forceref $hWnd, $iMsg Local $hWndFrom, $iIDFrom, $iCode, $hWndListBox, _ $sBookmark If Not IsHWnd($idListBox) Then $hWndListBox = GUICtrlGetHandle($idListBox) $hWndFrom = $lParam $iIDFrom = BitAND($wParam, 0xFFFF) ; Low Word $iCode = BitShift($wParam, 16) ; Hi Word Switch $hWndFrom Case $idListBox, $hWndListBox $sBookmark = _GUICtrlListBox_GetText( $hWndFrom, _GUICtrlListBox_GetCurSel($hWndFrom) ) Switch $iCode Case $LBN_DBLCLK ConsoleWrite("you double-clicked " & $sBookmark & @CRLF) EndSwitch EndSwitch Return $GUI_RUNDEFMSG EndFunc Now, my question is: can one modify the _WM_COMMAND function to allow for a dynamic number of ListBoxes? (meaning, user-defined -- the amount of ListBoxes/pick lists can change at any time). Let's assume I dynamically obtained an array with ListBox ID's for (in this case) 5 pick lists: One part of the solution seems to work with the For... Next loop I added below, but I'm wondering if that is the ultimate? (knowing this Func has to be as fast as possible) The part where I can't find anything that works for a dynamic amount of ListBox ID's is in the Case check... I tried _ArrayToTxt($aIdListBox, ", ", 1), messed with Eval(), and trying Case $aIdListBox[start] To $aIdListBox[end] Func _WM_COMMAND($hWnd, $iMsg, $wParam, $lParam) #forceref $hWnd, $iMsg Local $hWndFrom, $iIDFrom, $iCode, $hWndListBox, _ $sBookmark For $i = 1 To UBound($aIdListBox) - 1 ; is this solution fast enough? (it seems to work well) If Not IsHWnd($aIdListBox[$i]) Then $hWndListBox = GUICtrlGetHandle($aIdListBox[$i]) ExitLoop ; cause there can only be one hit(?) EndIf Next $hWndFrom = $lParam $iIDFrom = BitAND($wParam, 0xFFFF) ; Low Word $iCode = BitShift($wParam, 16) ; Hi Word Switch $hWndFrom Case [WHAT TO PUT HERE if nr of ListBoxes is dynamic?], $hWndListBox ; <= MAIN question $sBookmark = _GUICtrlListBox_GetText( $hWndFrom, _GUICtrlListBox_GetCurSel($hWndFrom) ) Switch $iCode Case $LBN_DBLCLK ConsoleWrite("you double-clicked " & $sBookmark & @CRLF) EndSwitch Return $GUI_RUNDEFMSG EndFunc - - - As a workaround, I can probably add the maximum number of allowed ListBoxes to the Case check, seperated by commas, but only display the number of ListBoxes needed. But I'm hoping it can be made truly dynamical...? Thank You : )