I'm attempting to add widget support to a theme I maintain, and am running into problems. I am able to get widgets running with the default theme, to test that the plugin is functioning. In the process of widgetizing my own theme, I've added the "if... else..." line to sidebar.php and have created a functions.php to register the sidebar. Unfortunately, the "sidebar widgets" tab never appears in the presentation menu and I continue to see my static sidebar after making the changes. No errors are given and nothing else looks out of the ordinary. For what it's worth, my theme is based on another theme that did not previously make use of functions.php.
I've carefully read the instructions at Automattic.com and am at a bit of a loss as to how to proceed. If there's any additional documentation or suggestions anyone might have I'd be grateful.