Blank Item in Undo/Redo List After Clicking Lock Cell Tool

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In the versions of Microsoft Excel listed at the beginning of this article, you can display the Lock Cell tool by following these steps:

1. On the Tools menu, click Customize. Click the Commands tab.
2. In the Categories list, click Format. Scroll to the bottom of the Commands list.
3. Drag the Lock Cell tool from the Commands list and to an existing toolbar.
4. Click Close.

If you click the Lock Cell tool, and then click the Undo tool on the Standard toolbar, the list of actions you can undo contains a blank item at the top of the list. If you click the blank item, Microsoft Excel undoes the action performed by the Lock Cell tool. If you then click the Redo tool, the list of actions you can redo also contains a blank item at the top of the list.