Bug 209128 BIRT Cross tab Model Change - Support for filter on measures
TO support filter condition on cross tab measure, Model changes are needed to support filter condition list on cross tab report item.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/MeasureViewHandle.java
*/
	public void removeHeader( ) throws SemanticException
	{
		DesignElementHandle headerCell = getHeaderCell( );
		if ( headerCell != null )
		{
			headerCell.drop( );
		}
	}
	/**
	 * Adds header cell for current measure. If header cell already exists, this
	 * method just does nothing.
	 * 
	 * @throws SemanticException
	 */
	public void addHeader( ) throws SemanticException
	{
		PropertyHandle propHandle = getHeaderProperty( );
		if ( propHandle.getContentCount( ) > 0 )
		{
			logger.log( Level.INFO,
					"Measure header is set, need not add another" ); 
			return;
		}
		ExtendedItemHandle headerCell = CrosstabExtendedItemFactory
				.createCrosstabCell( moduleHandle );
		propHandle.add( headerCell );
	}
}