code: public void setControlValue(Object value)
      {
          Boolean boolValue = null;
          if (value instanceof String)    // Always
              if (((String)value).length() > 0)
                  boolValue = new Boolean((String)value);
          if (boolValue == null)
              boolValue = Boolean.FALSE;
          this.setSelected(boolValue.booleanValue());
      }
docs: Set the value of this checkbox.
  @param value The value to set.