I get an error whenever I try to drag a control onto the SF TabControl. Let me know if you guys get the same error.

When you drop a tab control onto the form, its tabs collection will be blank by default, so you'll need to add at least 1 page to it before you can drop any controls onto the tab page.  Also, there are a couple issues with the tab page's designer, so you might not be able to move the controls around with the mouse once you get them dropped on the page; the arrow keys work fine for positioning, but the mouse input sometimes has some issues.