Function defined for dragComputation not called

Hi,

I have defined a function for dragComputation in a node, however this function was not getting called when I moved the node around inside the diagram. What do I have to set to make the function being called when I move the node around?

Thanks.

As you can see in the http://gojs.net/latest/samples/swimLanes.html sample, that should work. How are you setting it up?