<MyWidget:BindableCalendarCombo
    x:Style="BORDER | COMPACT | DROP_DOWN | DATE_SHORT" name="dod"
    input="{Binding Path= dod}">
    <MyWidget:BindableCalendarCombo.singleSelection>
     <Binding path="dod"></Binding>
    </MyWidget:BindableCalendarCombo.singleSelection>
   </MyWidget:BindableCalendarCombo>

public class BindableCalendarCombo extends Viewer implements ICalendarListener{

 private CalendarCombo calendarCombo;
    public BindableCalendarCombo(Composite parent) {
  this(parent,BORDER | DROP_DOWN  );
  
 }
 public BindableCalendarCombo(Composite parent, int style) {
  this.calendarCombo=new CalendarCombo(parent, style);
  this.calendarCombo.addCalendarListener(this);
  this.calendarCombo.setDate(new Date());
 }

 @Override
 public Control getControl() {
  return this.calendarCombo.getCombo();
 }

 @Override
 public Object getInput() {
  return calendarCombo.getDate().getTime();
 }

 @Override
 public ISelection getSelection() {
  if(this.calendarCombo!=null){
  Date date=calendarCombo.getDate().getTime();
  if(date!=null){
  StructuredSelection selection=new StructuredSelection(date);
  if(selection!=null)
  return selection;
  }
  }
  
    return StructuredSelection.EMPTY;
  
  
 }

 @Override
 public void refresh() {
  
 }

 @Override
 public void setInput(Object input) {
  this.calendarCombo.setDate((Date) input);
  
 }

 @Override
 public void setSelection(ISelection selection, boolean reveal) {
  if(selection instanceof Date && selection!=null){
   this.updateSelection(selection);
  }
  
 }
 protected void updateSelection(ISelection selection) {
  SelectionChangedEvent event = new SelectionChangedEvent(this, selection);
  this.fireSelectionChanged(event);
 }
 @Override
 public void dateChanged(Calendar date) {
  if(date!=null)
  this.updateSelection(new StructuredSelection(date.getTime()));
  
 }
 @Override
 public void dateRangeChanged(Calendar start, Calendar end) {
  // TODO Auto-generated method stub
  
 }
 @Override
 public void popupClosed() {
 
  
 }
 public void setDate(Date date){
  if(date !=null )
  this.calendarCombo.setDate(date); 
 }
 
 

}