Activate Bake object

Hi everybody, I am new for Elefront and I use RH5. I made a GH with Elefront to sorting rectangles. The result was good, and I got what I wanted. But when I want to make this GH as cluster, I encounter a problem. Please see below my GH!
How can I make “bake object” and “reference for Bake name” activate and update automatically after I select multi breps?
Sort rectangle with width and height 2.gh (24.3 KB)