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 value;
	}
	/**
	 * Returns the value of a property as a string which is locale independent.
	 * 
	 * @param propName
	 *            the name of the property
	 * @return the internal string property value of the property.
	 */
	public String getStringProperty( String propName )
	{
		return getElement( ).getStringProperty( module, propName );
	}
	/**
	 * Return a localized string version of the property. This method will works
	 * for all property types except a list. Dates and numbers will be converted
	 * using the current locale. Display name will be returned for a choice or a
	 * color property.
	 * 
	 * @param propName
	 *            the name of the property
	 * @return a localized string version of the property.
	 */
	public String getDisplayProperty( String propName )
	{
		return getElement( ).getDisplayProperty( module, propName );
	}
	/**
	 * Returns the value of a property as a Boolean.
	 *