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/ColumnBandInsertAction.java
*            the 0-based column number
	 * @throws SemanticException
	 */
	private void insertCell( RowHandle row, int columnIndex )
			throws SemanticException
	{
		assert row != null;
		
		int pos;
		if ( columnIndex == 0 )
			pos = 0;
		else if ( columnIndex == adapter.getColumnCount( ) - 1 )
			pos = -1;
		else
		{
			CellHandle cell = adapter.findCell( row, columnIndex );
			if ( cell == null )
				return;
			if ( cell.getColumnSpan( ) != 1 )
			{
				cell.setColumnSpan( cell.getColumnSpan( ) + 1 );
				return;
			}
			pos = cell.getContainerSlotHandle( ).findPosn( cell ) + 1;
		}
		if ( pos != -1 )
			row.addElement( new Cell( ).getHandle( adapter.getModule( ) ),
					TableRow.CONTENT_SLOT, pos );
		else
			row.addElement( new Cell( ).getHandle( adapter.getModule( ) ),