It would be nice to hide the Clock-Button of the TimePicker control whenever I want to. For example I would like to hide the button, when the TimePicker is disabled. I could define a binding for that or just hide the button indefinitely.

Maybe with a dependency Property "bool HidePopupButton" or "Visibility HidePopupButton". So that I could use it like this:

<TimePicker HidePopupButton="True" />
or
<TimePicker HidePopupButton="{Binding IsEnabled, RelativeSource={RelativeSource Self}, Converter={StaticResource InvertBooleanConverter}}" />

We have similar controls in our project, where the button is hidden, when the control is disabled. With the TimePicker we want to have the same behaviour.