what I do to call the main window : 1st call the quickpaste menu, and just press w --> there you have your window!
(Main hotkey for the quick paste menu : Options --> startup / hotkeysmenu --> quickpaste menu --> ctrl + Alt + q ?? )
You could also write a little AHK script to bring up the main window.
Something like :
this is basically : win+S to invoque CH+spell main window if ctrl+alt+q was your shortcut for the quick paste menu.
The sleep command is not the best way though... But I didn't give it much thought... The best would be to use something like "WinWait," but I 'm not sure...
But of course other built in CH+S hotkey would be better...