Shane, did you solve this issue. Hristo seems to have glossed over what you actually asked and posted about how to use the NullableValue property. I now have the same issue as you described...
A RadDateTimePicker is bound to a database date column that can have a Null value. Properties as displayed in VS2015:
DataBindings.Value = [BindingSource - ColumnName]
NullText = "No date selected"
Text = [the date I added the control to the form]
Value = [the date/time I added the control to the form]
When run and the database value is Null, the control correctly displays "No date selected". When the user clicks the dropdown to choose a date from the calendar, the default date is the date the control was added to the form.
What I need, and I think you also wanted, is the calendar by default (when the underlying value was previously Null), to display the current date and not the date when the control was added to the form at design-time.
Is there a way at run-time to set this default date?