[Glamour] GLMDiffPresentation seems to no longer work

> Open the moose panel.
> Browse a small model.
> on 'all famixClasses', rigth click and click on Utilities >> Compute  
> duplication.
> Now, from 'all dudemultiplications', browse 'constellation'.
> In the browser, when clicking on a multiplication, opening the  
> GLMDiffPresentation raise an error: Message not understood:  
> GLMDiffPresentation >> allowsDeselection.
>
> http://code.google.com/p/moose-technology/issues/list?thanks=449&ts=1283506221
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