drools-eclipse/org.guvnor.tools/src/org/guvnor/tools/views/model/TreeParent.java
public Object getParent(Object o) {
            if (o instanceof TreeObject) {
                return ((TreeObject)o).getParent();
            } else {
                return null;
            }
        }
public Object getParent(Object o) {
            if (o instanceof TreeObject) {
                return ((TreeObject)o).getParent();
            } else {
                return null;
            }
        }
/*
(non-Javadoc)
@see org.eclipse.ui.model.IWorkbenchAdapter#getParent(java.lang.Object)