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[news.eclipse.modeling.gmf] cast exception for an EAttribute

hello,
in my editor the root edtipart has an EAtribute and i need to get that attribute but it seems to not be working. i can reach to it but i get a cast exception everytime i try to get it. can some of you tell me how can i access the attribute of my root edit part of my editor?
i can access it with ((XXXImpl)this.getDiagramGraphicalViewer().getContents()).getAtribute(); inside the YYYYDiagramEditor class but i get


java.lang.ClassCastException: YYYY.diagram.edit.parts.EditorEditPart cannot be cast to YYYY.impl.XXXImpl

when i try this ((EditorEditPart)this.getDiagramGraphicalViewer().getContents()).getAtribute(); then the attribute is not visible.

can anyone help me?