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 target position is one after specified column.
	 */
	private static final int INSERT_BEFORE = -1;
	/**
	 * 0-based column index.
	 */
	private int targetColumnIndex;
	List originalCells = null;
	public ColumnBandInsertAction( ColumnBandAdapter adapter )
	{
		super( adapter );
	}
	/**
	 * Checks whether the paste operation can be done with the given copied
	 * column band data, the column index and the operation flag.
	 * 
	 * @param columnIndex
	 *            the column index
	 * @param insertFlag
	 *            The column insert sign. 1 insert after position. -1 insert
	 *            before position
	 * @return <code>true</code> indicates the paste operation can be done.
	 *         Otherwise <code>false</code>.
	 */
	protected boolean canInsert( int columnIndex, int insertFlag )
	{
		int columnCount = adapter.getColumnCount( );
		targetColumnIndex = columnIndex;
		if ( insertFlag == INSERT_BEFORE )
			targetColumnIndex = targetColumnIndex - 1;