config.selectActionFunction problem for CKEditor integration

Couldn't anybody please put the code how set up your own handler on selectActionFunction?

I put next code in /ckfinder/config.js file:

CKFinder.customConfig = function( config )
{
    config.selectActionFunction = function (fileUrl, data) {
        alert( 'Selected file: ' + fileUrl );
    };
};

But it doesn't works at all. When I select the image there is no any alerts.

And I used ckeditor.html example:

//html part
<textarea id="editor1" name="editor1" rows="10" cols="80"></textarea>

//javascript part
var editor = CKEDITOR.replace( 'editor1' );
editor.setData( '<p>Just click the <b>Image</b> or <b>Link</b> button, and then <b>&quot;Browse Server&quot;</b>.</p>' );
CKFinder.setupCKEditor( editor, {
    basePath : '/ckfinder/'
} ) ;

What did I do wrong?