GXT 3 Date Field Min & Max Date

I want to set min dan max date for datefield and want it disable the selection of dates out of specified range.

DateField dateField = new DateField(new DateTimePropertyEditor(DateTimeFormat.getFormat("dd-MMM-yyyy")));
dateField.getDatePicker().setMinDate(mindate);
dateField.getDatePicker().setMaxDate(maxdDate);