title: (WPF) How can a separator be added between items in an ItemsControl - Bug Fixing
body: <p>I found solution on this site(How can I input separator between items in an ItemsControl(<a href="https://stackoverflow.com/questions/2511227/how-can-a-separator-be-added-between-items-in-an-itemscontrol">click</a>) And found bug=((( 
  Here is it:</p>
  
  <p><img src="https://i.stack.imgur.com/2LLac.png" alt="enter image description here"></p>
  
  <p>It hapens when I trying to resize ItemsControl(I've set property "HorizontalScrollBarVisibility" to "Disable") Any ideas How should I fix this bug?</p>