private function defaultCustomFilterFunction($o:Object, $str:String):Boolean
			{
				var x:XML = $o as XML;
				var b:Boolean = x.hasOwnProperty('@show');

				if(b && x.@show == 'true')
				{
					b = true;
				}
				else
				{
					b = false;
				}


				if ($str.length == 0)
				{
					return b;
				}

				var str:String = labelFunction( $o );

				switch (_matchType)
				{
					case MATCH_ANY_PART:
						return StringUtils.contains( str, $str ) && b;
					case MATCH_BEGINNING:
						return StringUtils.beginsWith( str, $str ) && b;
					case MATCH_WORD:
						return StringUtils.anyWordBeginsWith( str, $str ) && b;
				}

				return false;
			}