Added support of 'drill-down' (i.e on_click) on bar charts

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@1313 a333f486-631f-4898-b8df-5754b55c2be0

pages/php-ofc-library/ofc_bar_glass.php

@@ -47,6 +47,12 @@ class bar_value
 	{
 		$this->tip = $tip;
 	}
+	
+	function on_click( $event )
+	{
+		$tmp = 'on-click';
+		$this->$tmp = $event;
+	}
 }
 
 class bar extends bar_base