Sample App Accessibility Issues

I'm submitting a...

• Sample app request

Current behavior

• Should first tab after searchbox (default focus on launch) be the category list?
• extra invisible tab stops on home page (section headers?)
• If you use keyboard to select a category (like Controls) to open, the next tab stop is on the sample instead of the inner list, so it'd very confusing to navigate to a sample. (Focus list with Tab (Shift-Tab after launch), hit enter...)
• Can get stuck with info pane open when using keyboard to open it:

Expected behavior

For the category list, should we move focus to the sample list after selection? If not, we should at least make it the next tab stop...

Info pane should close on keyboard input.