Fix orphaned buttons lurking under toolbox blocks.
Fix orphaned buttons lurking under toolbox blocks.

git-svn-id: 2cf55447cea94972d775c94cce66c944ede0459c@4 c400ca83-b69d-9dd7-9705-49c6b8615e23

adrgerez/ardublockly,tobyk100/blockly-trunk,Khan/blockly,carlosperate/ardublockly,carlosperate/ardublockly,peterkinmond/mazely,bollwyvl/Blockly,jadonk/blockly-bonescript,TechplexEngineer/EasyJ4FRC,carlosperate/ardublockly,tjpalmer/blockly,TechplexEngineer/EasyJ4FRC,CocoMake7/CocoBlockly,CocoMake7/CocoBlockly,tobyk100/blockly-trunk,tobyk100/blockly-trunk,Khan/blockly,TechplexEngineer/EasyJ4FRC,peterkinmond/mazely,adrgerez/ardublockly,kallex/blockly,adrgerez/ardublockly,tobyk100/blockly-trunk,bollwyvl/Blockly,jadonk/blockly-bonescript,kallex/blockly,TechplexEngineer/EasyJ4FRC,tjpalmer/blockly,CocoMake7/CocoBlockly