Dynamically Change a List 
Modify the previous exercise, so that
- 
When the user selects a month, your program will automatically adjust
the list for days.
    
    - 
January - 31 days
    
 - 
April - 30 days
    
 - 
June - 30 days
    
 - 
etc.
    
 
 - 
When the user clicks the button, your program will calculate what day the
selected day is, and show a message like "2013-06-04 is Tuesday".
 -  You may need the function
GetCount
and 
DeleteString.