Bug 157174 [Viewers] Refactor new Viewer API
We are yet not completely happy with the API and refactor it.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
*/
	public CellEditor[] getCellEditors() {
		return treeViewerImpl.getCellEditors();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getCellModifier()
	 */
	public ICellModifier getCellModifier() {
		return treeViewerImpl.getCellModifier();
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected Item[] getChildren(Widget o) {
		if (o instanceof TreeItem) {
			return ((TreeItem) o).getItems();
		}
		if (o instanceof Tree) {
			return ((Tree) o).getItems();
		}
		return null;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getColumnProperties()
	 */
	public Object[] getColumnProperties() {
		return treeViewerImpl.getColumnProperties();
	}
	/*
	 * (non-Javadoc) Method declared in Viewer.