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
/**
	 * Returns the caption text of this crosstab.
	 * 
	 * @return the caption text
	 */
	public String getCaption( )
	{
		return handle.getStringProperty( CAPTION_PROP );
	}
	/**
	 * Returns the resource key of the caption.
	 * 
	 * @return the resource key of the caption
	 */
	public String getCaptionKey( )
	{
		return handle.getStringProperty( CAPTION_ID_PROP );
	}
	/**
	 * Returns the measure direction of this crosstab. The return value is
	 * defined in <code>ICrosstabConstants</code> and can be one of:
	 * 
	 * <ul>
	 * <li><code>MEASURE_DIRECTION_HORIZONTAL</code>
	 * <li><code>MEASURE_DIRECTION_VERTICAL</code>
	 * 
	 * </ul>
	 * 
	 * @return the measure direction of this crosstab
	 */