If you draw over previously drawn lines, the new lines appear behind the original lines

[swakulchik]

If an author

1. Draws some lines (let's say red, but it can be any color)
2. Draws new lines over those lines (let's say blue)
3. Views the image as a learner - then he won't see any blue lines that were drawn over red lines

Right now the first lines drawn on canvas appear on top, whereas the last lines drawn appear on bottom - it should be opposite so that lines can be drawn over other lines.

http://screencast.com/t/6CvUAeKvaz