For a while now I have been creating .Net add-in controls for Dynamics NAV (2009 R2 – 2013 R2). One thing I learned early on (and which Vjekoslav Babic has mentioned here, I suggest you read that first in order to make sense of this post) is that you need to ensure your control add-in has been instantiated before you try to access it via NAV.
Posted inDynamics NAV & BC Tips & tricks