title: How to refer to BG-color, used by some Windows elements (scrollbar, pushed-in option button, etc.)?
body: <p>Does anybody know how can I reference in C# a system background color, used on elements like scrollbar or pushed-in option button or tab (as the background for 'tabPage1' in the image below)?<br>
  Or, if no predefined const exists, any algorithm how to create a Brush with this color?  Thank you!</p>
  
  <p><img src="https://i.stack.imgur.com/m018r.png" alt="background for tabPage1 indicates desired color"></p>
  
  <p>My intuitive first choice <code>SystemColors.ScrollBar</code> results in same as <code>.Control</code>  or <code>.ButtonFace</code> (BG for 'tabPage2'), which is really a "face" color for the scrollbar, not what I'd call "background".<br>
  <code>SystemColors.ControlLight</code> or <code>SystemColors.ControlLightLight</code> do not get any closer..</p>
  
  <p>When zoomed in, that area of the control looks like a checker-board with <code>.Control</code> and <code>.Window</code> pixels, so to me that hints at a possibility of this color being dithered;  maybe that indicates the reason why standard <code>SystemColors</code> enum does not define it?  How would I apply it to another control?</p>
  
  <p><img src="https://i.stack.imgur.com/vSgDa.png" alt="zoomed-in view exposes the dithering"></p>
  
  <p>P.S.: I'm trying to enhance a custom TabControl (which supports disableable tabs - another good thing missing from std controls, but that's another and already solved story), so that when its <code>.Appearance</code> is set to <code>Buttons</code> or <code>FlatButtons</code>, it looks similar to the original (illustrated above).   Selected tab is indicated by a pushed-in button, but its background color is set to  <code>Control</code> or <code>ButtonFace</code>:</p>
  
  <p><img src="https://i.stack.imgur.com/juzMg.png" alt="enter image description here"></p>