docs: def queryBuilderWidget( self ):
          """
          Returns the query builder widget instance that this widget is \
          associated with.
          
          :return     <XQueryBuilderWidget>
          """
          from projexui.widgets.xquerybuilderwidget import XQueryBuilderWidget
          
          builder = self.parent()
          while ( builder and not isinstance(builder, XQueryBuilderWidget) ):
              builder = builder.parent()
          
          return builder