Yeah, but can I add my own pull down or only edit yours?

I'm trying to do this... I want the command attribute to be passed to the server via a call back.

        <PipCommands>
            <item text="[[NotSet]]" value="null"></item>
            <item text="save new version" value="SaveNew" command="SaveNew"></item>
            <item text="update old version" value="UpdateOld" command="UpdateOld"></item>
            <item text="view history" value="ViewHistory" command="ViewHistory"></item>
            <item text="add comment" value="Comment" command="Comment"></item>
            <item text="view comments" value="ViewComments" command="ViewComments"></item>
            <item text="delete/hide" value="Delete" command="Delete"></item>
            <item text="share" value="Share" command="Share"></item>
            <item text="label" value="Label" command="Label"></item>
            <item text="domain" value="Domain" command="Domain"></item>
            <item text="properties" value="Properties" command="Properties"></item>
        </PipCommands>   

Also, is there a way to add a separator  in the pull down?