context: using ultraGridFilterUIProvider for excel alike filters on datetime columns. (Infragistics4.Win.UltraWinGrid.v18.1, Version=18.1.20181.88)

my issue starts when i try to set a stored/recreated value for a filter on my application.

Infragistics.Win.UltraWinGrid.ColumnFilter columnFilter = getColumn();
Infragistics.Win.UltraWinGrid.FilterComparisionOperator filterOperator = getFilterOperator();
object value = getStoredFilterOperand();
columnFilter.FilterConditions.Add(filterOperator, value);

I can set a value with a DateHierarchyFilterOperand instance, but I cannot instantiate a MonthOperand nor a RelativeDateOperand nor a QuarterOperand instance, since these class are internal. So I am not able to set a filter condition with any of these.

Any advice will be appreciated.

Thanks