Keep button class in a logical order e107::getForm()->button(); and admin_button() modified. Test added.

'button' has been removed when the action == 'button' in order to avoid BC css conflict. Use button[type="button"] if needed.

e107_handlers/chart_class.php

@@ -189,7 +189,9 @@ class e_chart
 		if(!empty($type))
 		{
 			$this->provider = $type;	
-		}	
+		}
+
+		return $this;
 	}
 	
 	public function getProvider()