title: Items collection cannot be modified when the DataSource property is set
body: <p>I get this error while trying to add items to the combobox at runtime.Is there a way to add items on runtime , even if my combobox datasource is set .</p>
  
  <p>Example:My combobox has items , but i want to display "Select Category" type of statement when my form loads .
  Thanks !!!</p>