ActiveScaffold - custom show action

Hi all, I've added custom show action (as an action link - I want to use default one too). Everything renders well, but I'm missing a "Close" () button. So, I copied AS' default _show.rhtml template and edited it a bit (just added custom output and removed label). However, when I click at "Close" I get error output:

You have a nil object when you didn't expect it! The error occurred while evaluating nil.theme

<div id="<%= active_scaffold_id -%>" class="active-scaffold active-scaffold-<%= controller_id %> <%= active_scaffold_config.theme %>-theme">

Why is active_scaffold_config nil?

Thank you for any help.