0xfe/vexflow — pull request #270 by timaschew (2014-11-24 09:44:15+00:00)
Title: clear canvas on sandbox code changes

This fixes an issue, when you copy somehting from the tutorial to the sandbox, see screen gif:

![gif screenshot](http://i.gyazo.com/cf729d61b9c241303f0f945309625664.gif)