I'm using a MathInputControl to receive handwritten input for the steps involved in solving a math exercise. I'd like to allow the user to go back to a previous step in the solution and edit the input for that step. MathInputControl allows loading previously saved ink, but it doesn't provide a way to save it.
I can receive its processed output (in MathML) by handling the Insert event, but I can't recover the user's handwriting from that.
I tried QueryInterface-ing to an IInkPicture, IInkEdit or an IInkCollector that allow saving ink, but MathInputControl doesn't implement any of them.
Concretely, is there a way to save a user's handwriting from a MathInputControl (in addition to receiving the MathML output) ?