How to clear Rhino Pick Button?

I’m trying to make an interface that gives the option to clear the geometry that has been referenced by the user with the “Pick Rhino Button” but I can’t seem to figure it out. Once the user has set the elements they can only change it or leave it, there’s no clear or reset that I can see.

Any help would be greatly appreciated.


Bumping… Trying to figure this out as well

Found this from an older post.