Bug 123406 Add geLocaltStringProperty in GroupElementHandle and GroupPropertyHandle
Please refer to 123405. GUI need a way to get the local setting of given property because current getStringPropery method will return inherited value if there are no local value.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
try
		{
			Iterator iter = propertyIterator( );
			while ( iter.hasNext( ) )
			{
				GroupPropertyHandle propHandle = (GroupPropertyHandle) iter
						.next( );
				String propName = propHandle.getPropertyDefn( ).getName( );
				if ( DesignElement.EXTENDS_PROP.equals( propName ) )
				{
					
					continue;
				}
				propHandle.clearValue( );
			}
		}
		catch ( SemanticException e )
		{
			stack.rollback( );
			throw e;
		}
		stack.commit( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isExtendedElements()
	 */
	public boolean isExtendedElements( )
	{