Delete/Replace widget with fresh instance

Good Afternoon All, First thanks for a great way to make simple GUIs in Common Lisp. In my current application I have a tray of buttons. This currently gets populated from a directory path defined by the user. I keep this frame as a special variable in Common Lisp so I can easily access it across all functions. Is there a way to get the parent of a widget currently? How about a list of all children? I'd like to write a function that saves the frame's parent, deletes the frame on CL and Tcl sides, then binds and packs a new frame instance in it's place. Here is a picture of my little launcher program. https://i.imgur.com/GiOaez7.png You can see how the frame exists inside a notebook and contains buttons. Thanks for any help!