Get Rad grid row index on toggle button state change

[Yash]

I have a rad grid and on every row i have rad toggle button, now i want whenever user change state of toggle button then in javascript i have to get row index of rad grid.

I have written following

its giving me toggle button that state just changed but now i want row index of radgrid where this control resides

function toggleStateChangedDir(sender, args) {

 var getElement= $telerik.$(sender.get_element());

}