+ void insert(char, MathTextCodes t = LM_TC_MIN);
+ /// can we enter the inset?
+ bool openable(MathInset *, bool selection) const;
+ /// can the setPos routine enter that inset?
+ bool positionable(MathInset *, bool selection) const;
+ /// write access to cursor cell position
+ int & pos();
+ /// write access to cursor cell index