Bug 185898 ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType.
ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType. The first method provider the available ReportItem list of DataBindingReference. The second method provider the type of the DataBinding.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportItemHandle.java
/**
	 * Constructs the handle for a report item with the given design and
	 * element. The application generally does not create handles directly.
	 * Instead, it uses one of the navigation methods available on other element
	 * handles.
	 * 
	 * @param module
	 *            the module
	 * @param element
	 *            the model representation of the element
	 */
	public ReportItemHandle( Module module, DesignElement element )
	{
		super( module, element );
	}
	/**
	 * Returns the data set of the report item.
	 * 
	 * @return the handle to the data set
	 */
	public DataSetHandle getDataSet( )
	{
		DesignElement dataSet = ( (ReportItem) getElement( ) )
				.getDataSetElement( module );
		if ( dataSet == null )
			return null;
		assert dataSet instanceof DataSet;
		return (DataSetHandle) dataSet.getHandle( dataSet.getRoot( ) );
	}
	/**