This article was previously published under Q281628
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This article describes how to change the behavior of taskbar grouping in Microsoft Windows XP.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
By default, when you enable the Group similar taskbar buttons option in Taskbar properties, items are grouped only when the taskbar buttons begin to get too small, and then the item that you opened first, is grouped first.
To change this behavior, create a "TaskbarGroupSize" DWORD entry in the following registry key: