Call Member nodes should only refresh the first time they are selected

```
Currently, every time a Call Member node which has already been selected but 
not yet expanded is selected, it triggers a refresh of the node text, this 
should only happen once: either the first time the node is selected exor 
expanded


```

Original issue reported on code.google.com by `stephen....@gmail.com` on 1 Aug 2011 at 4:10
