drools-eclipse/org.drools.eclipse/src/main/java/org/drools/eclipse/editors/rete/ReteViewer.java
protected void configureGraphicalViewer() {
        super.configureGraphicalViewer();
        GraphicalViewer viewer = getGraphicalViewer();
        viewer.getControl().setBackground( ColorConstants.white );
        viewer.setEditPartFactory( new VertexEditPartFactory() );
        viewer.setRootEditPart( rootEditPart );
        viewer.setKeyHandler( new GraphicalViewerKeyHandler( viewer ) );
    }
protected void configureGraphicalViewer() {
        super.configureGraphicalViewer();
        GraphicalViewer viewer = getGraphicalViewer();
        viewer.getControl().setBackground( ColorConstants.white );
        viewer.setEditPartFactory( new VertexEditPartFactory() );
        viewer.setRootEditPart( rootEditPart );
        viewer.setKeyHandler( new GraphicalViewerKeyHandler( viewer ) );
    }
/* (non-Javadoc)
@see org.eclipse.gef.ui.parts.GraphicalEditor#configureGraphicalViewer()