Tobias Pape uploaded a new version of ToolBuilder-MVC to project The Trunk:
http://source.squeak.org/trunk/ToolBuilder-MVC-topa.43.mcz

==================== Summary ====================

Name: ToolBuilder-MVC-topa.43
Author: topa
Time: 8 July 2015, 5:37:19.575 pm
UUID: 9a12e4ba-acbe-4854-8db9-93c3efe1d7a5
Ancestors: ToolBuilder-MVC-mt.42

Cope for ToolBuilder-Kernel-topa.90

=============== Diff against ToolBuilder-MVC-mt.42 ===============

Item was changed:
  ----- Method: MVCToolBuilder>>buildPluggableSpacer: (in category 'widgets required') -----
  buildPluggableSpacer: aSpec
  	
  	| widget |
  	widget := View new.
  	self register: widget id: aSpec name.
  
  	widget borderWidth: 0.
+ 	widget backgroundColor: (aSpec color ifNil: [Color transparent]).
- 	widget backgroundColor: aSpec color.
  	widget window: (widget window topLeft extent: aSpec extent).
  	
  	self setFrame: aSpec frame in: widget.
  
  	parent ifNotNil:[parent addSubView: widget].
  	^widget!