[news.eclipse.modeling.gmf] Disable "Delete From Diagram"

[Arne <Erazerx@xxxxxx>]

Hello all,

my Diagram Editor is synchronised to a model. The "Delete From Diagram"
Action is disabled for all elements... except for one.
I don't think i made something different on creating that element.

The only difference i see, is that the element, where the "Delete From
Diagram" Action is available, is a Association that can have an other
association as source or target.

However, is there a way to manually disable the "Delete From Diagram"
Action?

I was looking around in the corresponding Edit-Policy class, but
couldn't find a command that gets created from that class, that is
responsible for the action.

Thx in advance, Arne