Bug 147676 [regression]Visibility set in the first col will affect the second col
Description: Visibility set in the first col will affect the second col Steps to reproduce: 1. Insert a grid(3*3), insert contents to each cell. 2.Set the first col to hide all in visibility and preview Expected result: Only the first col is hidden. Actual result: The second col is hidden, too. If you set the second col in step2, the third col will disappear.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
* create a table band using the items in slot.
	 * 
	 * @param elements
	 *            items in DE's IR
	 * @return TableBand.
	 */
	private TableBandDesign createTableBand( SlotHandle elements )
	{
		TableBandDesign band = new TableBandDesign( );
		for ( int i = 0; i < elements.getCount( ); i++ )
		{
			apply( elements.get( i ) );
			if ( currentElement != null )
			{
				band.addRow( (RowDesign) currentElement );
			}
		}
		return band;
	}
	/**
	 * Creates the property visibility
	 * 
	 * @param visibilityRulesIterator
	 *            the handle's rules iterator
	 * @return null only if the iterator is null or it contains no rules,
	 *         otherwise VisibilityDesign
	 */
	protected VisibilityDesign createVisibility(
			Iterator visibilityRulesIterator )
	{