Homework #13 
-  Goal: 
Create menus and toolbars in your application.
- Please UPLOAD your homework (ZIP or RAR file) to TA at
  http://ms11.voip.edu.tw/cs102/ 
- Deadline: 2008/5/18 11:00 AM
-  Requirement: 
    
    -  Based on the example developed in Chapter 13,
        
	-  Add a menu item Ellipse to the Element pop-up menu.
	
-  Implement the command and comman dupdate handlers for it in
	the document class.
	
-  Add a toolbar button corresponding to the Ellipse menu item
	and add a tooltip for the button.
	
-  Modify the command update handlers for the color menu items
	so that the currently selected item is displayed in uppercase,
	and the others are displayed in lowercase.
	
 Hint: Use the SetText() method.