IgbDatePicker ValueChanged event does not fire when clearing when Mode=Dialog

[agoldenbaum]

Steps to Reproduce:

1. Run the attached sample project and open the dev console window.
2. Select a date.
3. Click the clear button.

Result:
After step 2, the value is shown in the console because the ValueChanged event is hit. The event is not hit after step 3, but it should be as the value is changing.

datePickerBug.zip