Add a select button

I want to add a select button in to ckfinder like image:


full image
http://img209.imageshack.us/img209/5497/ckfinder1.png
Ckfinder has supported double click on file to select file for input(textbox). But I want to add a button that when user click on the button will perform the same function as the double click.
Please help me.