Disable the buttons added using Addon by default.

Hi i want to know if this is possible in a toolbar added
using a Addon using Java.
   
   Suppose the toolbar contains 3 buttons.(A, B,C)  Is it
possible to have only one button enabled(A is enabled) and
the other two buttons disabled. ( B and C disabled) by
default. 
   
  Onclick of button A i would like to enable either B or C. 
   
  public void trigger(String sEvent)
          {   
                    String buttonName;
                    buttonName=sEvent;
                   
if(buttonName.equals("buttonA"))
                          first();
                    else
if(buttonName.equals("buttonB"))
                                second();
                    else
if(buttonName.equals("buttonC"))
                                third();
          }
   
  public void first()
  {
  // disable second() and third ()
  // check for a condition
  //enable second()
  // or third()
  }
   
  Or can i disable second() and third() in  public void
initialize and enable second() and third() onclick of button
A.
   
          public void initialize( Object[] object )
              throws com.sun.star.uno.Exception 
          {
              // disable second() 
              // disable third ()
          }
          
          public String[] getSupportedServiceNames() {
              return getServiceNames();
          }
   
  When does public void initialize( Object[] object ) gets
executed? 
             
     
  With Regards,
  Bharathy B
   
   


 		
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