Stillborn dragstart event

The ClientWebApp sample application in GWT 2.5 contains example
drag-and-drop code, as seen below.
When I use it, it works great the first time I drag a TaskTemplate. On
subsequent drags, event.getDataTransfer() fails because
event.dead=true. Halp?

public class DesktopTaskEditView extends Composite implements TaskEditView {
//...
static class TaskTemplateCell extends AbstractCell<TaskProxy> {
//...
public TaskTemplateCell() {
// Register the kinds of event this cell will manage.
super("dragstart");
}
//...
/**
* Handles "drag-start" events inside the element named "root".
*/
@UiHandler({"root"})
void onDragStart(DragStartEvent event, Element parent, Context context) {
// Save the ID of the TaskProxy.
DataTransfer dataTransfer = event.getDataTransfer();
dataTransfer.setData("text", String.valueOf(context.getIndex()));

// Set the image.
dataTransfer.setDragImage(parent, 25, 15);
}
}
//...
}

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