#Warn

OnMessage(0x404, "AHK_NOTIFYICON")

Hotkey, F5, Off

Gui, Add, Checkbox, vOptCheckBox Checked, enable/disable checkbox
Gui, Add, Button, gExitbutton, Save and Exit
Gui, Show

return

F5::
    MsgBox, Hi, this is F5
return

ExitButton:
    Gui, Submit, Hide
    Hotkey, F5, % (OptCheckBox ? "On" : "Off")
    while (OptCheckBox)
    {
        MsgBox, Hi, this is while
    }
return

AHK_NOTIFYICON(wParam, lParam)
{
    if (lParam = 0x202) ; WM_LBUTTONUP
    {
        Gui, Show,, Hotkeys
    }
    else if (lParam = 0x205) ; WM_RBUTTONUP
    {
        Menu, Tray, Show
    }
}