Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeEditorImpl.java
return;
		}
        treeItem = selection[0];
        
        showSelection();
        columnNumber = column;
        activateCellEditor();
    }
    abstract Rectangle getBounds(Item item, int columnNumber);
    /**
     * Get the ViewerCell Editors for the receiver.
     * @return CellEditor[]
     */
    public CellEditor[] getCellEditors() {
        return cellEditors;
    }
    /**
     * Get the cell modifier for the receiver.
     * @return ICellModifier
     */
    public ICellModifier getCellModifier() {
        return cellModifier;
    }
    abstract int getColumnCount();
    /**
     * Get the column properties for the receiver.
     * @return Object[]
     */
    public Object[] getColumnProperties() {
        return columnProperties;