drools-eclipse/org.guvnor.tools/src/org/guvnor/tools/views/RepositoryContentProvider.java
public Object [] getChildren(Object parent) {
        if (parent == invisibleRoot) {
            return ((TreeParent)invisibleRoot).getChildren();
        } else if (parent instanceof TreeParent) {
            return manager.getChildren(parent);
        }
        return new Object[0];
    }
public Object [] getChildren(Object parent) {
        if (parent == invisibleRoot) {
            return ((TreeParent)invisibleRoot).getChildren();
        } else if (parent instanceof TreeParent) {
            return manager.getChildren(parent);
        }
        return new Object[0];
    }
/*
(non-Javadoc)
@see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)