title: CodenameOne ComboBox NumberFormatException
body: <p>This code</p>
  
  <pre><code>ComboBox&lt;Map&lt;String, Object&gt;&gt; combo = new ComboBox&lt;&gt; (
  createListEntry("A Game of Thrones", "1996"),
  createListEntry("A Clash Of Kings", "1998"),
  createListEntry("A Storm Of Swords", "2000"),
  createListEntry("A Feast For Crows", "2005"),
  createListEntry("A Dance With Dragons", "2011"),
  createListEntry("The Winds of Winter", "2016 (please, please, please)"),
  createListEntry("A Dream of Spring", "Ugh"));
  
  combo.setRenderer(new GenericListCellRenderer&lt;&gt;(new MultiButton(), new MultiButton()));
  conPaid.addComponent(combo);
  </code></pre>
  
  <p>is throwing NumberFormatException</p>
  
  <blockquote>
    <p>java.lang.NumberFormatException: For input string: "true"
    at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    [EDT] 0:0:14,365 - Exception: java.lang.NumberFormatException - For input string: "true"
      at java.base/java.lang.Integer.parseInt(Integer.java:652)
      at java.base/java.lang.Integer.parseInt([EDT] 0:0:14,365 - Exception: java.lang.NumberFormatException >- For input string: "true"
    Integer.java:770)
      at com.codename1.ui.plaf.UIManager.getThemeConstant(UIManager.java:1259)
      at com.codename1.ui.List.initLaf(List.java:313)
      at com.codename1.ui.Component.(Component.java:692)
      at com.codename1.ui.List.(List.java:301)
      at com.codename1.ui.ComboBox.(ComboBox.java:150)
      at com.codename1.ui.ComboBox.(ComboBox.java:134)
      at >net.chibex.ozioma.gui.widget.NewsletterListInfoContainer.fillComponents(NewsletterListInfoContainer.java:116)
      at net.chibex.ozioma.gui.widget.NewsletterListInfoContainer.(NewsletterListInfoContainer.java:42)
      at net.chibex.ozioma.gui.NewsletterListInfoForm.beforeShow(NewsletterListInfoForm.java:66)
      at net.chibex.ozioma.gui.NewsletterListInfoForm.show(NewsletterListInfoForm.java:42)
      at >net.chibex.ozioma.gui.widget.HomePhoneLayoutContainer.lambda$addContent$2(HomePhoneLayoutContainer.java:329)
      at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:349)
      at com.codename1.ui.Button.fireActionEvent(Button.java:579)
      at com.codename1.components.FloatingActionButton.fireActionEvent(FloatingActionButton.java:327)
      at com.codename1.ui.Button.released(Button.java:613)
      at com.codename1.components.FloatingActionButton.released(FloatingActionButton.java:334)
      at com.codename1.ui.Button.pointerReleased(Button.java:712)
      at com.codename1.ui.Form.pointerReleased(Form.java:3590)
      at com.codename1.ui.Dialog.pointerReleased(Dialog.java:1769)
      at com.codename1.ui.Component.pointerReleased(Component.java:4679)
      at com.codename1.ui.Display.handleEvent(Display.java:2289)
      at com.codename1.ui.Display.edtLoopImpl(Display.java:1214)
      at com.codename1.ui.Display.invokeAndBlock(Display.java:1393)
      at com.codename1.ui.Display.invokeAndBlock(Display.java:1432)
      at com.codename1.ui.Form.showModal(Form.java:2358)
      at com.codename1.ui.Dialog.showModal(Dialog.java:1138)
      at com.codename1.ui.Dialog.show(Dialog.java:582)</p>
  </blockquote>