Shoutbox

Hi, I'm building a script and on there's a point where you have a PlusWnd and when you click on a button it writes something on the ChatWnd. The problem is that I can't do it.

[code]function OnWndCharSelectEvent_CtrlClicked(PlusWnd, ControlId)
{
    switch(ControlId)
    {
        case "BtnClose":
            PlusWnd.Close(0);
            break;
           
        case "BtnInsert":
        var currenttext = ChatWindow.EditText;
        var SelectedChar = PlusWnd.Combo_GetCurSel("cbcChar");
        ChatWnd.EditText_ReplaceSel(SelectedChar);
        break;
    }
}[code]

I get "ChatWnd not defined" how can I define it? Can't find it.