The 
Open Rotation window opens a rotation,
and also allows for creating, deleting or copying a rotation.
This window can be invoked from the 
Main Window
via the 'Rotation' button then selecting 'Open Existing Rotation',
or from the 
Rotation Window
via the menu option 'File | Open Rotation'.
 
Select a rotation to open, then press the Open Rotation button,
or press the Cancel button to close the window.
Toolbar buttons:
- 
  |  | - Prompts for 'Preferences - New Rotation',
       then creates a new rotation. |  
  |  | - Opens the 'Preferences - this Rotation' dialog box. |  
  |  | - Prompts for confirmation, then deletes the selected rotation. |  
  |  | - Prompts for confirmation, then makes a copy of the selected rotation. |  
  |  | - Allows the grid to be customized.
    See Customize Grid |  
  |  | - Displays this help page. |