* The HS button can be hidden with HotspotButtonVisibility="Collapsed"
* The undo and redo operations can be turned on/off with IsUndoEnabled="true/false". The default value is false. When turned off, the two relevant buttons will be hidden in the toolbar. {{Version/WinXSince|4.4}}
{{Attention|Please be careful when you enable undo and redo. Because {{key press|Ctrl}} + {{key press|Z}} (or whichever other combination in your keyboard layout) is the shortcut to trigger an undo. Therefore, it's possible that you accidentally undo/revert your changes in the PDF viewer when you are typing.}}
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