title: How to expand node added to TreeView of hidden Form?
body: <p>c# windows forms App-based software is under development.
  The problem is that the node I added to the TreeView control is not expanded.</p>
  <p>The execution procedure is as follows.</p>
  <ol>
  <li>Execute winform with Opacity = 0, ShowInTaskbar = false</li>
  <li>Add a node to the TreeView control in the winform and then expand the node (TreeView.ExpandAll)</li>
  <li>Show winform with system tray icon
  Issue: The TreeView control's nodes are shrunk.</li>
  </ol>
  <p>The solution I found is
  After displaying the winform at startup ('Opacity=1') or executing with'ShowInTaskbar=true', adding a node to the TreeView control and expanding it works fine.</p>
  <p>I'm new to C#, which keeps using only MFC, but I can't understand this behavior. Is there a more vivid solution?</p>
  <p>Thank you very much.</p>