Bug 182000 Cross tab layout behavior
In the current approach of cross tab layout view, the arrow is associated with the first data item in the cell. - User cannot delete measure and level data items which have arrow with them. -Wenbin has concerns with the approach, as this will make the UI very restrictive. - Also user may want to delete data item and just show image in a cross tab cell. We had a discussion with Bang, and he has revised the mockups for the layout - The idea is that the arrow is associated with the cross tab cell and not data item. Let us know if there are any issues with supporting this.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/model/CrosstabCellAdapter.java
* Sets the position type
	 * 
	 * @param positionType
	 */
	public void setPositionType( String positionType )
	{
		this.positionType = positionType;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.item.crosstab.internal.ui.editors.model.BaseCrosstabAdapter#copyToTarget(org.eclipse.birt.report.item.crosstab.internal.ui.editors.model.BaseCrosstabAdapter)
	 */
	public BaseCrosstabAdapter copyToTarget( BaseCrosstabAdapter crossAdapt )
	{
		if ( crossAdapt instanceof CrosstabCellAdapter )
		{
			CrosstabCellAdapter copy = (CrosstabCellAdapter) crossAdapt;
			copy.setColumnNumber( getColumnNumber( ) );
			copy.setRowNumber( getRowNumber( ) );
			copy.setColumnSpan( getColumnSpan( ) );
			copy.setRowSpan( getRowSpan( ) );
			copy.setPositionType( getPositionType( ) );
		}
		return super.copyToTarget( crossAdapt );
	}
	/**
	 * @return
	 */
	public DataItemHandle getFirstDataItem( )
	{
		List list = getCrosstabCellHandle( ).getContents( );