In stead of selecting the condition in the model and then double click the condition in the right hand bottom corner, just enable double clicking on the condition arrow in the model to do the same.
When you double-click on the condition line, open the window to set the condition, instead to go until de properties windows to do the same thing.
You have my like, Leandro.
It should have the same behavior as an Assign with only 1 assignment.
Cheers!
Yes, this is what I expect when clicking on the connector.