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
* @param index
	 *            a 0-based integer of the dimension position
	 * @return the dimension view handle if found, otherwise null
	 */
	public DimensionViewHandle getDimension( int axisType, int index )
	{
		CrosstabViewHandle crosstabView = getCrosstabView( axisType );
		return crosstabView == null ? null : crosstabView.getDimension( index );
	}
	/**
	 * Gets the row/column dimension count. 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 count of row/column dimension
	 */
	public int getDimensionCount( int axisType )
	{
		CrosstabViewHandle crosstabView = getCrosstabView( axisType );
		return crosstabView == null ? 0 : crosstabView.getDimensionCount( );
	}
	/**
	 * Finds a measure view that refers a cube measure element with the given
	 * name.
	 * 
	 * @param name
	 *            name of the cube measure element to find
	 * @return measure view if found, otherwise null