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
* Returns the row with the given slot id, group id and the row number.
	 * 
	 * @param slotId
	 *            the slot id
	 * @param groupId
	 *            the group id
	 * @param rowNumber
	 *            the row number
	 * @return the row that matches the input parameters
	 */
	abstract protected RowHandle getRow( int slotId, int groupId, int rowNumber );
	/**
	 * Returns the position where the cell resides in the row.
	 * 
	 * @param row
	 *            the row handle
	 * @param columnToInsert
	 *            the column number to insert, count from 1
	 * @param insert
	 *            whether insert mode
	 * @return the position indexing from 1
	 */
	protected int findCellPosition( RowHandle row, int columnToInsert,
			boolean insert )
	{
		SlotHandle cells = row.getCells( );
		for ( int i = 0; i < cells.getCount( ); i++ )
		{
			CellHandle cell = (CellHandle) cells.get( i );
			int cellPos = getCellPosition( cell );