Bug 211703 Support muti-view on report item.
As title described.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/CrosstabReportItemHandle.java
{
		MeasureViewHandle measureView = getMeasure( name );
		if ( measureView == null )
		{
			logger.log( Level.SEVERE,
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND,
					name );
			throw new CrosstabException( handle.getElement( ), new String[]{
					name, handle.getElement( ).getIdentifier( )},
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND );
		}
		measureView.handle.drop( );
	}
	/**
	 * Removes a measure view in the given position.
	 * 
	 * @param index
	 *            the position index of the measure view to remove, 0-based
	 *            integer
	 * @throws SemanticException
	 */
	public void removeMeasure( int index ) throws SemanticException
	{
		getMeasuresProperty( ).drop( index );
	}
	/**
	 * Moves the dimension view with the given name to the target index in the
	 * target row/column. The axis type can be either
	 * <code>ICrosstabConstants.ROW_AXIS_TYPE</code> or
	 * <code>ICrosstabConstants.COLUMN_AXIS_TYPE</code>. And index is 0-based