<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif"><p>Hi,</p>
<p>Ah, of course, I should have realized that myself.</p>
<p>It would be nice if there was a warning or a property developers can set to prevent that, for example, to check and throw an error if a node is used twice.</p>
<p>Thanks for pointing it out, and apologies for reporting a non-issue.</p>
<p>
</p><p></p><p></p><p>(P.S. I sent another email just before this that I don't think falls into the same user-error category!)</p><p><br></p><p><br></p><p>Kind regards,<br>
Cormac</p></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, 8 Nov 2025 at 23:08, John Hendrikx <<a href="mailto:john.hendrikx@gmail.com">john.hendrikx@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>

  
    
  
  <div>
    <p>Hi,<br>
    </p>
    <p>I'm guessing you're setting the disappearing item as "Graphic",
      because it is a Label and not a string.  However, you can only set
      a Node (anywhere, including as graphic) in one part of the scene
      graph.  Setting it somewhere else will cause it to be removed in
      the old location (without warning unfortunately).<br>
    </p>
    <p>In this case, the Label is likely used as graphic in two places:
      once in the list (as a cell), and once in the edit area (as
      another cell) of the ComboBox when it was the last one selected. 
      This is causing the odd disappearing artifact.</p>
    <p>Best practice is to not use Nodes as items for a ComboBox. 
      Instead, use a Record or some other type that the
      ListCell::updateItem will convert to be shown in the way you want.<br>
    </p>
    <p>--John<br>
    </p>
    <div>On 08/11/2025 22:26, Cormac Redmond
      wrote:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">
        <div class="gmail_default" style="font-family:verdana,sans-serif">Hi,</div>
        <div class="gmail_quote">
          <div dir="ltr">
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif">There is a bug
              whereby if you select a ComboBox item the item disappears
              / becomes invisible.</div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif">This ComboBox
              consists of strings and a Label node and the Label node
              will disappear from the dropdown if it's selected (though,
              continue to take up space).</div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif">I'm just picking
              a Label for example, it appears to happen with any Node
              that I've tried.</div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif"><img src="cid:ii_19a65fadaca62d851e01" alt="bug_cb.gif" width="322" height="380"><br>
            </div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif">Steps to
              reproduce (JFX 26, master branch)<span class="gmail_default" style="font-family:verdana,sans-serif">. Note</span>:<span class="gmail_default" style="font-family:verdana,sans-serif"> </span>I've kept
              the sample small<span class="gmail_default" style="font-family:verdana,sans-serif"> intentionally</span>,
              but if you use a CellFactory (to call setText<span class="gmail_default" style="font-family:verdana,sans-serif">()</span> or
              setGraphic<span class="gmail_default" style="font-family:verdana,sans-serif">()</span>
              accordingly, <span class="gmail_default" style="font-family:verdana,sans-serif">as normal), </span>the
              <i><span class="gmail_default" style="font-family:verdana,sans-serif"></span>same</i>
              thing happens<span class="gmail_default" style="font-family:verdana,sans-serif">. In other words,
                the bug doesn't seem to be because of "mis-use" of the
                ComboBox by mixing types -- I think</span><span class="gmail_default" style="font-family:verdana,sans-serif">.</span></div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div><font face="monospace">public class
                ComboBoxDisappearingItemBug extends Application {<br>
                    public static void main(String[] args) {<br>
                        launch(args);<br>
                    }<br>
                <br>
                    public void start(Stage stage) {<br>
                        ComboBox<Object> cb = new
                ComboBox<>();<br>
                        cb.getItems().addAll("Apple", "Banana", new
                Label("I will disappear"), "Carrot", "Lettuce");<br>
                        cb.getSelectionModel().selectFirst();<br>
                        stage.setScene(new Scene(cb, 200, 100));<br>
                        stage.show();<br>
                    }<br>
                }</font></div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif"><br>
            </div>
            <div style="font-family:verdana,sans-serif">Kind Regards,</div>
            <div style="font-family:verdana,sans-serif">Cormac</div>
          </div>
        </div>
      </div>
    </blockquote>
  </div>
</blockquote></div>