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Popup Listbox and return value to GUI?

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I have a GUI. I would like when a button is pressed on that GUI that another GUI opens with a listbox on it that displays a list of items to chose from. When the user choses one, the value should be returned to the main form.

I can do all of that except figure out how to pass the Selected item from the listbox form back to the main gui? I could do it the cheap way and write to the registry or something then have my main form read that registry entry, but I know from searching around there must be a way to pass the selection directly from the listbox GUI back to the main GUI? The forum searches I've done though so far haven't been helpful for me.



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$Frm_main = GUICreate("Test form")
$Btn_Test = GUICtrlCreateButton("test", 10, 10, 60, 25")
$Lbl = GUICtrlCreateLabel("", 10, 40, 60, 20)
Global $sVal

$Frm_2 = GUICreate("Form 2")
$List = GUICtrlCreateList("Apples|Oranges|Pears", 10, 10, 80, 40)


While 1
    $msg = GUIGetMsg()
    Switch $Msg
        Case -3
        Case $Btn_Test
            GUISetState(@SW_HIDE, $Frm_Main)
            GUISetState(@SW_SHOW, $Frm_2)
        Case $List
            $sVal = GUICtrlRead($List) ;;  You can actually use $Val = GUICtrlRead($msg) here
            GUISetState(@SW_SHOW, $Frm_main)
            GUIsetState(@SW_HIDE, $Frm_2
            GUICtrlSetData($Lbl, $sval)


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