CKfinder add OK / Cancel button

I'm searching for the code of adding dialog buttons on the CKfinder popup.
On my quest, I found this information:
http://docs.cksource.com/ckfinder_2.x_a ... .html.html

but I just want to add OK and CANCEL button.

I have this code now, very simple but still I don't see to get it right for the buttons:

 var finder = new CKFinder();
finder.basePath = '/CKfinder';
finder.selectActionFunction = SetFileField;
finder.popup();
finder.resourceType = 'Images';