var value = evt.getValue();

      var color = evt.getValue();

      this._field.setBackgroundColor( value );

      this._field.setBackgroundColor( color );

      this._list.setBackgroundColor( value );

      if( color == null ) {

        var tv = new org.eclipse.swt.theme.ThemeValues( {} );

        color = tv.getCssColor( "Combo", "background-color" );  

      } 

      this._list.setBackgroundColor( color );