Hello Sir ,
the Stylesheets are applied to the buttons already & its working fine with mouse events.
My requirement is to change the state i.e. from unselected button to the hovered button without moving mouse over it.
The button should be in hovered state .

In other words , just need to shift focus from one button to another when we press a arrow keys , like we set in other languages like setTabOrder() in HTML , setTabIndex()