Just to update my quest for the holy spotlight:
I guess I know what is going on: my editorPanel is greater than my viewPanel, but the spotlight is being created with the viewPanel dimensions. It sounds simple, just a matter of creating the editPanel in the right time, but well ... I have tried some options and still don't get it.
Again, my parent Panel is layout: 'card'.
Any clue where should I place/update the spotlight?