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    <pre><code>public class SelectionComboBox extends HorizontalPanel implements ClickHandler { private class ListItem extends Label implements ClickHandler { String text; public ListItem(String text) { this.text = text; this.setText(text); this.addClickHandler(this); } @Override public void onClick(ClickEvent event) { selectedValue = text; popup.hide(); } } CheckBox combo; FlowPanel list; PopupPanel popup; String selectedValue; Label triangle; public SelectionComboBox() { list = new FlowPanel(); popup = new PopupPanel(); combo = new CheckBox(); triangle = new Label(); list.add(new ListItem("All")); list.add(new ListItem("None")); list.add(new ListItem("Read")); list.add(new ListItem("Unread")); list.add(new ListItem("Starred")); list.add(new ListItem("Unstarred")); popup.setWidget(list); popup.setPopupPosition(this.getAbsoluteLeft(), this.getAbsoluteTop() + this.getOffsetHeight()); this.addDomHandler(this, ClickEvent.getType()); triangle.addClickHandler(this); this.add(combobox); this.add(triangle); } public void addValueChangeHandler(ValueChangeHandler&lt;Boolean&gt; handler) { combo.addValueChangeHandler(handler); } public String getSelection() { return selectedValue; } @Override public void onClick(ClickEvent event) { popup.show(); } } </code></pre> <p>Style for the triangle:</p> <pre><code>height:0; width:0; border-left:20px solid transparent; border-right:20px solid transparent; border-top:20px solid black; </code></pre> <p>The above styles will give you a triangle just using Css.</p> <p>You might have to add a feature that will not select the Checkbox if the list hasn't elements that apply to the selection.</p> <p>(Note: Code is untested, but should help you get started)</p>
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    1. USChris Boesing
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    1. COI had to do something similar and took similar approach. The subtleties are in getting the keyboard to work as well.
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      1. USDusty Campbell
    2. COI tried out the code, its reasonably close, but the main issue I don't see how to "fix". As the code is now, clicking on the checkbox pops-up the choices, instead, it should only show the choice on clicking the arrow, clicking the checkbox should select/deselect all the table rows with no pop-up selection. Do I use an image or somesuch to trigger the listbox?
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      1. USJoel
    3. CORemove this line: `this.addDomHandler(this, ClickEvent.getType());` and it will only popup the list if you click the arrow. Style the Label named triangle with the style I have provided and you get a arrow just using css which is smaller than an image,
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