Stuck with an interaction

I am trying to set this up so that the checking graph always shows up for the student regardless of the values they enter in the table, or how they change the values.

If I set the value of the checking flag, then I lose the ability for the control point to be adjusted.

Any ideas?

What value(s) do you mean?

The flag and union width and length.

Got it working. Adapted @Jay Button Reset • Activity Builder by Desmos