"Locking in" an answer

I have an interactive graph (a Venn Diagram) and I want to ask a series of questions where the student has to shade different regions of the diagram to get credit. Right now I am having them click on the graph itself to add shading. The <award> works just fine on the question itself, but as soon as they change the shading for the next question, the question resets back to “Check Answer”. This is great for being able to reset that question if they change their shading. However, I want to be able to somehow “lock in” their checked (and correct answer).

Venn Diagram Regions Questions

Solved my own problem: disableAfterCorrect