How to set the initially selected value of a DropDownChoice?

[Kaspar Fischer]

How can I set the default value of a required DropDownChoice that
should not have null values?
  private static final List<String> PagerSizesList =  
Arrays.asList("25", "50", "100");

  // in constructor...
  DropDownChoice pagerSizer = new DropDownChoice("search-page-size",  
PagerSizesList);
  add(pagerSizer);

I've tried overriding my DropDownChoice's getDefaultChoice(),

      @Override
      protected CharSequence getDefaultChoice(final Object selected)
      {
        return "<option value=\"\">" + PagerSizesList.get(0) + "</ 
option>";
      }

but this replaces the label of the null string, but does not remove
the null string itself.

Thanks and best wishes,
Kaspar

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