Cococa Interface maker

I am trying to find a nice way to make a file loader in Interface builder, teporarly I'm just using QCComposition parameter view connected to QCView or using QCPatchContoller connected to text field. It works, I have to mark the text field,drag the object onto the text file and press enter, which take time. Preferably I would use NSBrowse to look for the path or anything else that would open a folder contents view to look for a string. I could find any tutorial on connecting NSBrowse to QCPatchContoller, is the a way? I'm attaching how it works/looks now.