Silverlight DatePicker in DataGrid allow NULL dates

Question

I have a DataGrid that has as one of its columns a `DatePicker` (for the editing template). Is there a way to keep this but still allow a user to enter in a NULL date?

Accepted Answer

Do the following (in Silverlight 4):

1) Bound property of DataContext must be Nullable (or Datetime?)

2) In XAML set TargetNullValue='' of binding property something like:

```
Text="{Binding DocumentDate, Mode=TwoWay, StringFormat='yyyy-MM-dd', TargetNullValue=''}"
```

Silverlight DatePicker in DataGrid allow NULL dates

Solution

Problem