Make Timepicker easier to customize

[ScarletKuro]

Describe the feature

I want to increase the popup size of the TimePicker (maybe even override it in future). For example, this is easily achievable with the Calendar control:

<Style x:Key="MahApps.Styles.Resized.Calendar" TargetType="{x:Type Calendar}" BasedOn="{StaticResource MahApps.Styles.Calendar}">
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type Calendar}">
				<Viewbox Height="450" Width="450">
					<Grid x:Name="PART_Root"
						  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
						  Background="Transparent">
						<CalendarItem x:Name="PART_CalendarItem"
									  Background="{TemplateBinding Background}"
									  BorderBrush="{TemplateBinding BorderBrush}"
									  BorderThickness="{TemplateBinding BorderThickness}"
									  SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
									  Style="{TemplateBinding CalendarItemStyle}"  />
					</Grid>
				</Viewbox>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
</Style>

However, it’s much harder with the TimePicker. First of all, you can't do this:

<Style x:Key="MahApps.Styles.Resized.Time" TargetType="{x:Type mah:TimePicker}" BasedOn="{StaticResource MahApps.Styles.TimePickerBase}">

The problem is that MahApps.Styles.TimePickerBase is missing.

Second, I’d like to have more modularity. For example, it would be great if the popup could have a separate style that you could easily override, like:

<mah:TimePicker PopupStyle={...}>

Otherwise, you need to copy and paste the entire DateTimePicker.xaml.