[Wonder-disc] using Ajax to enable a wo:text destroys its contents (but not a wo:textfield)

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Hello all!  I'm trying to use an AjaxObserveField and an  
AjaxUpdateContainer to allow a user to turn on and off the edit- 
ability of some fields.

This was working great when I just had <wo:textfield>s but when I put  
in a <wo:text>, it is set to null on going from disabled to not  
disabled.

Here's a tiny working example of a component with this behavior:
<html>
<head><title>A title</title></head>
<body>
<wo:form>
<p>

<wo:AjaxObserveField updateContainerID="ucID">
Disabled? <wo:checkbox checked="$disabled"/><br/>
</wo:AjaxObserveField>

<wo:AjaxUpdateContainer id="ucID">
<wo:textfield value="$a" disabled="$disabled"/><br/>
<wo:text value="$b" disabled="$disabled"/><br/>
</wo:AjaxUpdateContainer>

</p>
<wo:submit action="$doNothingAction"/>
</wo:form>
</body>
</html>

package your.app.components;
import com.webobjects.appserver.WOActionResults;
import com.webobjects.appserver.WOContext;
import er.extensions.components.ERXComponent;

public class Main extends ERXComponent {
	public Main(WOContext context) {
		super(context);
	}

	public String a = "a";
	public String b = "b";
	public boolean disabled;

	public WOActionResults doNothingAction() {
	    return null;
	}
}

The "b" disappears whenever the "disabled" checkbox is unchecked; the  
"a" remains.

Any advice?

Thanks,
Robert