Active Tab
    Active tab is the currently selected Viewing
          Tab at the top of the
      Workbench Window.
      The title of the Active tab is shown in bold, unitalicized font,
      e.g., (1) Montage in the image.
    
    
      -  To select a tab to be the Active Tab,
          click on the tab title. 
      -  To set
            tab-specific display options, first select a
          particular tab as the Active tab, then make your selections.
      -  To rename the Active tab, select the Rename
            Selected Tab... option in the Window
                Menu. Tab numbers can not be edited by the
          user.
      - To reorder the tabs, click and drag the
          tab title to the desired position. The tab numbers will not
          change.
 
      