<p>How can I change the <strong>background color</strong> of a <strong>Tab Control</strong>.  I changed the forms color, but the tabs stay the same.</p>

<p>Thanks.</p>

Check the Back Style of the Tab Control. If it's Normal. you'll get a gray background (with normal Windows settings). If it's Transparent then it will inherit the background colour of the form.
If you want it to be an entirely different colour, you might have to add a rectangle to the form (make the background non-transparent), maximise it within the tab and then set the colour of the rectangle.
As for the tabs them selves, I don't see a way of setting their colour independently.