If you have the option 'Group similar taskbar buttons' set to 'on' in the taskbar properties, a menu will popup when you click any taskbarbuttons that are 'grouped'.
ex:
How this menu will appear is handled in that section of SKS.
One way of getting "around" using that section is simply to not use the two sections (remove section). This way the grouped menu will be handled by the toolbar menu.
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