UWP CalendarDatePicker control doesn't show placeholder when date is null about data-collection-dotnet HOT 3 CLOSED

This is a UWP bug: https://stackoverflow.com/questions/39775527/calendardatepicker-binding-null-value

Changing to x:Bind causes all sorts of problems, so marking this blocked.

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Looking into the x:Bind problems, it appears related to the following flow:

1. User presses 'save', which closes the editing session on the popup manager
2. Relationships are updated; each call to arcgisFeature.RelateFeature causes the feature's properties to be updated
3. Refreshing the properties changes the value (presumably raising PCE)
4. CalendarDatePicker, with x:Bind, gets the new (old) value, and raises a DateChanged event
5. The CalendarDatePicker's value update is rejected by the popup manager, because the editing session is closed

Using regular binding does not have this issue, perhaps it is checking to ensure the value is actually changed before raising PCE while x:Bind does not?

My next step is to try using the winUI controls; maybe they've improved the date changed behavior. WinUI controls don't have a date picker

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PR

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