title: Resize Splitter (for final user)
body: <p>Main question:<br>
  I have a Form that is MDI container and placed a Splitter.</p>
  
  <p>I need that the final user can customize the size of this Splitter. <strong>How?</strong> By default the mouse cursor changes to VSplit but the Splitter is always locked.</p>
  
  <p>Optional question:<br>
  This structure/visual layout of this program is identical to the Simatic 7. Example:</p>
  
  <p><img src="https://i.stack.imgur.com/G66US.jpg" alt="enter image description here"></p>
  
  <p>I'm guessing the Splitter is the better option to enable the two panels, the one on the left and the one on the bottom. Right? Or how to get the similar layout of the example?</p>