How to fire event

[HarryClaymore]

Hi. I wonder how could i fire an simple OnChangeEvent for Widget ?
It implements interface HasChangeHandlers.
I just want to fireEvent to mark widget as "changed"

exapmple:

selectAllButton = DasUtils.mkButton( GenericStrings.SELECT_ALL.toString
(), new Runnable() {
                        public void run() {
                                for ( int i = 0; i < lbRef[0].getItemCount(); 
i++ ) {
                                        lbRef[0].setItemSelected( i, true );
                                }
//                              SearchFieldAttrIn.this.fireEvent(  ); i dont 
know what to do
here.
//                              SearchFieldAttrIn.this.onBrowserEvent( new 
ChangeEvent() );
                        }
                } );

Thanks !

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