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
{
		this.module = module;
	}
	/**
	 * Returns the report design only when the module is report design.
	 * Otherwise, null is returned. So this method can also be used to check
	 * whether this element is in report design or library.
	 * 
	 * @return the report design, or null if the module is not report design.
	 * @deprecated replaced by getModule()
	 */
	public ReportDesign getDesign( )
	{
		if ( module instanceof ReportDesign )
			return (ReportDesign) module;
		return null;
	}
	/**
	 * Returns the module on which this handle is attached. The returned module
	 * must be <code>ReportDesign</code> or <code>Library</code>.
	 * 
	 * @return the module on which this handle is attached.
	 */
	public Module getModule( )
	{
		return module;
	}
	/**
	 * Returns the handle of report design only when the module is report
	 * design. Otherwise, null is returned.