Header double click

Dear all,

Double click event of a header is not able to call, plz help me in this regard.

I am using

obj.onHeaderDoubleClicked = function (event, index) { .. }

But it is not working.
How can I make this to work,
is there anyother way to set double click event for a header.

Plz help me, it is an urgent requiremet.

Thanks in advance.