Add class on a button onclick

[Jake]

Lets say for example I have a button and in ClientEvents>ExtEvents>added:

function added(sender, container, pos, eOpts)
{
  sender.addCls('b-menu');
}

What i want is onClick of the button i want to add this css:

.b-menu-over .b-menu{
	border-width:0px 0px 0px 7px !important;

}

I tried:

UniSession.AddJS(btnName.JSName + '.btnInnerEl.addCls("b-menu-over");');

but it doesnt change anything.

Any workaround? 

 

Thanks!