Closeable Toolbars

Command Bars allows you to specify whether a specific command bar can be closed.  If a command bar is not closeable, you will not be able to close or hide the command bar.  You can use this to make sure that important controls are always displayed.

Command Bars supports persistent Toolbars
Persistent Toolbars

Command Bars supports Closeable Toolbars
Closable Toolbars