title: How to make WPF TabItem Headers' Background transparent?
body: <p>I have a TabControl with a few TabItems. Each TabItem has a Grid with a TextBlock and one Image, which has transparent areas, in it.</p>
  
  <p>My goal is to have the Text and the Image completely visible and see the Window.Background Image through the transparent areas. </p>
  
  <p>Problem: No matter what I tried, there is a white background behind the Image and TextBlock I have set.</p>
  
  <p>I tried to set the TabControl Opacity to 0, but that makes the whole thing dissapear, as expected.
  Same result with the TabItem Opacity -> TabItem gets invisible.
  Next I set the TabItems Foreground, BorderBrush and Background to Opacity="0" what changes nothing at all :(</p>
  
  <p>I am relatively new to WPF and english is not my native language, so forgive me if my question is dumb and my english is bad.</p>
  
  <p>Thanks in advance!</p>
  
  <p>EDIT(Screenshotlink):  <a href="http://i.stack.imgur.com/NN8AR.png" rel="nofollow">http://i.stack.imgur.com/NN8AR.png</a></p>
  
  <p><br/> I can't post the screenshot, because I do not have 10 reputation, so I added the link to it.
  <br/>    I removed the images and only left the Textboxes so there is no confusion about that</p>