I have asked a question about CustomTaskPanes. It seems that we can implement lots of things inside a pane.
I think it is totally feasible to have a pane to display a program (in VBA or in other languages) or a text, my question is if it is possible to implement a point that allow users to highlight a line of text. It looks like a "breakpoint", but does not necessarily work exactly like a breakpoint for debugging. The implementation of this kind of point does not seem straightforward to me. Does anyone know if there is any technique inside CustomTaskPanes to do so?
PS: I made an image to illustrate the point, let's assume the pane is inside the excel editor and is a CustomTaskPane.