Hi,

I created a sample using the code you provided and it seems to work fine for me. I believe that your problem could be related to something else that is not in the code you provided. Nevertheless, I uploaded the sample to my SkyDrive account so you can use it.

• TreeView and InvokeCommandAction on Prism (Unity)
  

Regards,

Federico Martinez
http://blogs.southworks.net/fmartinez