Inconsistent control height and spacing between the control and its Header for TimePicker and CalendarDatePicker

[akshat157]

Describe the bug

The attached screenshot provides the best description of the height and spacing inconsistency.

When placed side by side without any spacing related properties, simply in a Grid, the TimePicker and CalendarDatePicker have inconsistent (unequal) spacing between their respective headers and have different control height.

Steps to reproduce the bug

In a basic WinUI 3 application, add the following Grid inside the Window control instead of the default StackPanel

<Grid HorizontalAlignment="Stretch" VerticalAlignment="Center" Grid.Row="0" Margin="0,10">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <CalendarDatePicker x:Name="CalendarDatePickerExecutionTime"
                        HorizontalAlignment="Stretch"
                        VerticalAlignment="Stretch"
                        Header="Date"
                        DateFormat="{}{year.full}/{month.integer}/{day.integer}"
                        Date="{x:Bind SelectedExecutionDate, Mode=TwoWay}"
                        Grid.Column="0"
                        Padding="20"
                        Margin="0,0,5,0" />
    <TimePicker x:Name="TimePickerExecutionTime"
                HorizontalAlignment="Stretch"
                VerticalAlignment="Stretch"
                Header="Time"
                SelectedTime="{x:Bind SelectedExecutionTime, Mode=TwoWay}"
                ClockIdentifier="24HourClock"
                Grid.Column="1"
                Margin="5,0,0,0" />
</Grid>

Expected behavior

Ideally, both the controls should be of the same height (or height that is easily adjustable), along with same spacing between their headers and the control.

Screenshots

NuGet package version

None

Windows version

Windows 11 (22H2): Build 22621

Additional context

It is extremely difficult to style these controls with the default properties. Most of the styling requires you to copy the whole style from generic.xaml even for very small changes, sometimes. I wish there was an easier way to modify the styles of these common controls.