InputPanel.java

package org.dominokit.samples;

import elemental2.dom.HTMLDivElement;
import org.dominokit.domino.ui.cards.Card;
import org.dominokit.domino.ui.forms.TextBox;
import org.dominokit.domino.ui.utils.BaseDominoElement;
import org.dominokit.domino.ui.utils.DominoElement;

public class InputElement extends BaseDominoElement<HTMLDivElement, InputElement> {
    private DominoElement<HTMLDivElement> root= DominoElement.div();

    public InputElement() {
        init(this);
        appendChild(Card.create()
                .appendChild(TextBox.create("Sample text input"))
        );
    }

    @Override
    public HTMLDivElement element() {
        return root.element();
    }
}

my gwt.xml

<?xml version="1.0" encoding="UTF-8"?>
<module>
  <inherits name="com.google.gwt.user.User" />
  <inherits name="org.dominokit.domino.ui.DominoUI"/>

  <source path="" />

  <entry-point class="org.dominokit.samples.App" />

 <collapse-all-properties/>
</module>