Missing method in mred:canvas%?
I used MrEd Designer to make a user interface for a Scheme program. It includes a mred:canvas% on which I'd like to plot points using draw-point. It's defined as: (define (naca-ui-init {...} #:airfoil-canvas-class (airfoil-canvas-class canvas%) {...}) and later: (set! airfoil-canvas (new ...