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
{
		return handle.getPropertyHandle( COLUMNS_PROP );
	}
	/**
	 * Gets the property handle for row/column crosstab views.The axis type can
	 * be either <code>ICrosstabConstants.ROW_AXIS_TYPE</code> or
	 * <code>ICrosstabConstants.COLUMN_AXIS_TYPE</code>.
	 * 
	 * @param axisType
	 *            row/column axis type
	 * @return property handle for row/column crosstab view
	 */
	protected PropertyHandle getCrosstabViewProperty( int axisType )
	{
		switch ( axisType )
		{
			case ROW_AXIS_TYPE :
				return getRowsProperty( );
			case COLUMN_AXIS_TYPE :
				return getColumnsProperty( );
		}
		return null;
	}
	/**
	 * Gets the row/column crosstab view for this crosstab. The axis type can be
	 * either <code>ICrosstabConstants.ROW_AXIS_TYPE</code> or
	 * <code>ICrosstabConstants.COLUMN_AXIS_TYPE</code>.
	 * 
	 * @param axisType
	 * @return