Bug 146481 Name is not necessary for extended element
Steps to reproduce: 1.New a label named "label" in library 2.New a report, extend lib.label Expected result: No name for the extended label Actual result: "label" is added as the name of label in report. It's not reasonable because "Restore Properties" is enabled even without properties change.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/EmptyGroupElementHandle.java
public boolean isExtendedElements( )
	{
		return false;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isPropertyReadOnly(java.lang.String)
	 */
	
	protected boolean isPropertyReadOnly( String propName )
	{
		return true;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getPropertyHandle(java.lang.String)
	 */
	
	public GroupPropertyHandle getPropertyHandle( String propName )
	{
		return null;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isInGroup(org.eclipse.birt.report.model.api.DesignElementHandle)
	 */
	
	protected boolean isInGroup( DesignElementHandle element )
	{
		return false;
	}
}