MSCRM open dialog and close issue

Hi,

As per our requirement we used below code to open poup in CRM 

Xrm.Internal.openDialog(webresourceurl,
DialogOptions,
null, null,
callBackFunction);

from popup we have to pass some data to the crm screen so we used below code,

 Mscrm.Utilities.setReturnValue(outputstr);

 above line is available in function and function is called on click of button.

after sending the response i have to close the popup immediately but its not working.

so in short after sending response to crm screen we are not able to close popup forcefully.

Any one have solution for this.