Unable to close Dialog in Moblie/Tablet

I am opening a dialog using below code in

Xrm.Navigation.openWebResource("/tt_/Scripts/SendQuoteToCustomer.html", windowOptions, data);

I am using below below code to close the window on cancel button click on dialogue . This seems to be working in WEB but not in Mobile and Table App.

this.top.close();

Thank in Advance.