Cocoa : How to set the delegate of a specific text field in a Table Cell View of a NSOutlineView?

Question

I would like to set the delegate of a TextField in a Table Cell View of my view based NSOutlineView. I try to se it like this :

html, body {
    min-height: 100%;
    height: 100%;
}
#sidebar{
    position: relative;
    width: 200px;
    border: 1px solid #000;
    min-height: 100%;
}
#scroller {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    overflow-y: scroll;
} 

This does not seems to work as the delegate methods are not triggered. Any help will be greatly appreciated. Thanks