Hi,
You can find the WD component by following these steps:
1. Download and install HTTPWatch Basic Edition: http://www.httpwatch.com/download
2. Start the tool in the browser and click on Record button
3. Navigate to your application in the portal
4. You should find a POST request containing ***/sap/bc/webdynpro/sap/*** in the url. Here you can find the application name (in this example wdr_test_ui_elements).
5. Go to transaction SE80 in the backend system
6. Click on Edit Object -> Enhanced Options -> Web Objects
7. Enter the application name here (in this example wdr_test_ui_elements).
8. Hit enter and the component name will be shown in the view.
Best regards,
Gabor