setIconCls is not reflecting its CSS

Hello Folks, I am dynamically setting an iconCls for a menu item on click. The problem is the menu item is set with the iconCls CSS but its not reflecting immediately. When i refresh it, the iconCls is set and reflecting as expected.



Please suggest me some measures to solve the issue .



I want the menu item to set and reflect the iconCls CSS on mouse click





Thanks In advance!!