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
if ( propHandle == null )
			return Collections.EMPTY_LIST.iterator( );
		return propHandle.iterator( );
	}
	/**
	 * Get a handle to deal with the bound column.
	 * 
	 * @return a handle to deal with the boudn data column.
	 */
	public PropertyHandle getColumnBindings( )
	{
		return getPropertyHandle( BOUND_DATA_COLUMNS_PROP );
	}
	/**
	 * Adds a bound column to the list.
	 * 
	 * @param addColumn
	 *            the bound column to add
	 * @param inForce
	 *            <code>true</code> the column is added to the list regardless
	 *            of duplicate expression. <code>false</code> do not add the
	 *            column if the expression already exist
	 * @param column
	 *            the bound column
	 * @return the newly created <code>ComputedColumnHandle</code> or the
	 *         existed <code>ComputedColumnHandle</code> in the list
	 * @throws SemanticException
	 *             if expression is not duplicate but the name duplicates the
	 *             exsiting bound column. Or, if the both name/expression are
	 *             duplicate, but <code>inForce</code> is <code>true</code>.