I usually find that the most obvious solutions are the right ones... I know that this may be obvious, but we all need to reminded of the "easy" fixes sometimes. Check your code for the following: 1) If you're registered correctly and the control renders when you debug, then you've done that correctly. 2) Make sure the control definition in the .cs file is using the correct class definition. 3) The methods you want to access... Ensure they are public and not protected or private.