XMLport Request Page in Nav 2013

I designed XMLPort and add some customization on its request Page. But doing that XMLPort's import and export window disappears, thus i lose the XMLPort's file selection and import/export options, my question is how can i retain these options and add some control on my own too.

If this is not possible then, what is simple way to add the file selection and import/export option on my own on the request page of the XMLPort.

 Please help

Thanks in Advance