Add pictures to help custom blocks

If you put a comment on the define block on a custom block, the text you put in the comment shows up in a help dialog when you press help on the block, but it would be great if we could put images in the help dialog.

Please tell me of a better title for this topic

Yeah. Really the issue is to add pictures (or at least Scratchblocks) to comments in general, then the help feature comes free.

All I need is to have pitures in the help feature

Right, but what I'm saying is, that help comes from a comment, and so it's just as easy to add pictures to comments in general as to special-case the comment attached to a hat block.