title: Resizing panel in winforms when splitter moves
body: <p>I have a three panel inside the panel named <code>panelbase</code></p>
  
  <p><img src="https://i.stack.imgur.com/TQB4r.png" alt="Image"></p>
  
  <p>I try with</p>
  
  <p>panel <code>left</code> dock is <code>left</code></p>
  
  <p>panel <code>right</code> dock is <code>right</code> and </p>
  
  <p>panel <code>button</code> is <code>fill</code>.</p>
  
  <p>but the button position is not in the center.</p>
  
  <p>here is the capture</p>
  
  <p><img src="https://i.stack.imgur.com/MUlNn.png" alt="Image2"></p>
  
  <p>How to resize panel <code>left</code> and panel <code>right</code>, when I drag a splitter, the panel button position always in center?</p>