ObjectDock opens same instance of application window
I have notepad shortcut in ObjectDock and when I click it, a new window of Notepad opens, but when I click it again, instead of opening another new window of Notepad, the existing Notepad window is shown. This happens with any shortcut (Word, Excel, etc.) on ObjectDock. How can I make ObjectDock open a new instance of an application window when I click a shortcut on its dock?
Thanks.