Composite widget that behaves as a single Editor

I have a composite widget composed by 3 TextBoxes that acts as a "date mask" field, like:[dd]/[mm]/[yyy] (dont ask why I am doing this :), I dont like DateBox and I have to force the user to keep given  format, so I wrote my own widget). Here is the java code:

import com.google.gwt.core.client.GWT;  import com.google.gwt.event.dom.client.KeyUpEvent;  import com.google.gwt.uibinder.client.UiBinder;  import com.google.gwt.uibinder.client.UiField;  import com.google.gwt.uibinder.client.UiHandler;  import com.google.gwt.user.client.ui.Composite;`enter code here`  import com.google.gwt.user.client.ui.TextBox;  import com.google.gwt.user.client.ui.Widget;    public class DateMaskWidget extends Composite {    private static DateMaskWidgetUiBinder uiBinder = GWT          .create(DateMaskWidgetUiBinder.class);    interface DateMaskWidgetUiBinder extends UiBinder<Widget, DateMaskWidget> {  }    @UiField  TextBox daysTextbox;  @UiField  TextBox monthsTextbox;  @UiField  TextBox yearsTextbox;    public DateMaskWidget() {      initWidget(uiBinder.createAndBindUi(this));        daysTextbox.setMaxLength(2);      monthsTextbox.setMaxLength(2);      yearsTextbox.setMaxLength(4);  }    @UiHandler("daysTextbox")   void onKeyUp(KeyUpEvent event)  {      //if 2 chars were entered focus the next box      if(daysTextbox.getText().length()==daysTextbox.getMaxLength())          monthsTextbox.setFocus(true);  }  @UiHandler("monthsTextbox")   void onKeyUp2(KeyUpEvent event)  {      //if 2 chars were entered focus the next box      if(monthsTextbox.getText().length()==monthsTextbox.getMaxLength())          yearsTextbox.setFocus(true);  }      }

Now I'd like this widget to behave as a single Editor (like a single TextBox), so i can set a value to it by passing a string like xx/xx/xxxx .
The Question is: which interface do I need to implement and which methods do I need to override to achive this?? Which methods are used in the editor framework to set/get the value of an editor??
In the background, I will need to take the given string (probably passed in a method like setValue() ), split it in 3 parts, and assign each part to the right text box. And same thing for a getValue() method.
Thanks for your help

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