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/core/Module.java
public DesignElement findParameter( String name )
	{
		return resolveNativeElement( name, PARAMETER_NAME_SPACE );
	}
	/**
	 * Gets a name space.
	 * 
	 * @param ns
	 *            The name space ID.
	 * @return The name space.
	 */
	public NameSpace getNameSpace( int ns )
	{
		assert ns >= 0 && ns < NAME_SPACE_COUNT;
		return nameSpaces[ns];
	}
	/**
	 * Returns the module name space instance for the given name space in this
	 * module.
	 * 
	 * @param nameSpace
	 *            the name space ID
	 * @return the module name space for the given name space
	 */
	public IModuleNameSpace getModuleNameSpace( int nameSpace )
	{
		assert nameSpace >= 0 && nameSpace < NAME_SPACE_COUNT;
		return moduleNameSpaces[nameSpace];
	}
	/**