title: Transparent background of xp-themed control
body: <p>I have a few window controls drawn on a bitmap as well as on colored background on a dialog-box. Would there be some possible way to make the window controls' background transparent? Currently they show the default colored background of a dialog-box.</p>
  
  <p>Example - I tried to paste a solid blue bitmap and the two button controls have the noticeable default colored-rectangle background.</p>
  
  <p><img src="https://i.stack.imgur.com/h5gER.png" alt="Dialog window containing two UI-buttons in the middle: &#39;OK&#39; and &#39;Cancel&#39;. Though the buttons are a default off-white, most of the inside area of the dialog-box has a shocking bright blue background."></p>