Bug 179931 Provide new interface IStyle to let extension return the style properties values
Provide the IStyle interface to let extension user can return the style property value list for their extension elements.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/extension/PeerExtensionTest.java
.getProperty( ExtendedItem.EXTENSION_NAME_PROP );
		assertNotNull( extensionName );
	}
	/**
	 * 
	 * @throws Exception
	 */
	public void testActionHandleInExtension( ) throws Exception
	{
		openDesign( FILE_NAME_3 );
		ExtendedItemHandle extendedItem = (ExtendedItemHandle) designHandle
				.findElement( "testBox" ); 
		assertNotNull( extendedItem );
		PropertyDefn actionDefn = (PropertyDefn) extendedItem
				.getPropertyDefn( IImageItemModel.ACTION_PROP );
		assertNotNull( actionDefn );
		ImageHandle image = (ImageHandle) designHandle
				.findElement( "testImage" ); 
		ActionHandle imageAction = image.getActionHandle( );
		assertNotNull( imageAction );
		String actionString = ModuleUtil.serializeAction( imageAction );
		ActionHandle extendedAction = ModuleUtil.deserializeAction(
				actionString, extendedItem );
		assertNotNull( extendedAction );
		assertNotNull( extendedItem.getProperty( IImageItemModel.ACTION_PROP ) );
		assertEquals( extendedItem, extendedAction.getElementHandle( ) );
	}
	/**
	 * Tests the error handler of extension loader.
	 *