Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* 
	 * @return the handle of report design, or null if the module is not report
	 *         design.
	 * @deprecated replaced by getModuleHandle()
	 */
	public ReportDesignHandle getDesignHandle( )
	{
		if ( getDesign( ) != null )
			return (ReportDesignHandle) getDesign( ).getHandle( module );
		return null;
	}
	/**
	 * Returns the handle of module. The returned module must be
	 * <code>ReportDesignHandle</code> or <code>LibraryHandle</code>.
	 * 
	 * @return the handle of module
	 */
	public ModuleHandle getModuleHandle( )
	{
		return (ModuleHandle) getModule( ).getHandle( getModule( ) );
	}
	/**
	 * Returns the element to which this handle is attached.
	 * 
	 * @return The attached element. Will be null if the handle is not attached.
	 */
	public abstract DesignElement getElement( );
	/**
	 * Gets the definition of the element. The definition provides meta-data
	 * about the element, such as its type name, list of defined properties,