Hi Ivan,
I used the approach in your example project RadGridView-WPF-AR-19. It works for setting the Visibility binding of my PropertyDefinitions from the code-behind, but there was a negative side-effect. In the case that the Visibility is set to false, all the bindings of the PropertyDefintions below seem to get mangled showing zeros and NaN rather than the values of their bound viewmodel properties.
Please advise.