Bug 151960 Library element popup menu display is wrong.
1:Creat a libray, add a table to this libray. 2:public this library. 3:Creat a report design. 4:Open the library explore, drag the table to the layout editor. 5:Select the table row, copy the selection row. 6:Select other row, clik the right button of the mouse to popup the menu . The result:Paste action and insert copied column action is highlight.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ColumnBandAdapter.java
* <li>Each time, only one column can be copied/pasted.
 * <li>Slot layouts between the source grid/table and the target grid/table
 * must be same.
 * </ul>
 * 
 */
abstract class ColumnBandAdapter
{
	/**
	 * Returns the element where the copy/paste operation occurs.
	 * 
	 * @return the element
	 */
	protected abstract ReportItemHandle getElementHandle( );
	/**
	 * Returns the module where the element belongs to.
	 * 
	 * @return the module
	 */
	protected Module getModule( )
	{
		return getElementHandle( ).getModule( );
	}
	/**
	 * Returns the column slot.
	 * 
	 * @return the column slot
	 */
	protected abstract SlotHandle getColumns( );
	/**