Here is demo example for catching/processing doubleclick NOTIFY message on StatusBar control also with distinguishing on which part of statusbar was clicked ; http://msdn.microsoft.com/en-us/library/windows/desktop/bb760734%28v=VS.85%29.aspx
#include <GUIConstantsEX.au3>
#include <WindowsConstants.au3>
#include <GuiStatusBar.au3>
Global $hGUI = GUICreate("Statusbar doubleclick demo", 400, 300)
$sb_dblclk_id = GUICtrlCreateDummy() ; statusbar doubleclick ID
$label = GUICt