When instantiation (via Use instantiation button) fails "Use instantiation" button becomes disabled and no error is reported
|Status:||New||Start date:||08 Jun 2012|
We should tell the user that instantiation fails.
Moreover, it looks like for the current test step, once an instantiation attempt fails, the instantiation button becomes stuck in disabled state,
and it is only enabled again in a subsequent test step. This is wrong.