Semi.Avalonia/src/Semi.Avalonia/Controls/DateTimePickerShared.axaml

<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!--  Add Resources Here  -->

    <ControlTheme x:Key="DateTimePickerFlyoutButton" TargetType="Button">
        <Setter Property="RenderTransform" Value="none" />
        <Setter Property="Template">
            <ControlTemplate>
                <ContentPresenter
                    Name="PART_ContentPresenter"
                    HorizontalContentAlignment="Stretch"
                    VerticalContentAlignment="Stretch"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    Content="{TemplateBinding Content}"
                    CornerRadius="{TemplateBinding CornerRadius}"
                    Foreground="{TemplateBinding Foreground}" />
            </ControlTemplate>
        </Setter>

        <Style Selector="^:pointerover /template/ ContentPresenter#PART_ContentPresenter">
            <Setter Property="BorderBrush" Value="{DynamicResource DateTimePickerButtonPointeroverBorderBrush}" />
        </Style>

        <Style Selector="^:disabled /template/ ContentPresenter#PART_ContentPresenter">
            <Setter Property="BorderBrush" Value="{DynamicResource DateTimePickerButtonDisabledBorderBrush}" />
            <Setter Property="Background" Value="{DynamicResource DateTimePickerButtonDisabledBackground}" />
        </Style>
    </ControlTheme>

    <!--  Theme for the items displayed in the selectors  -->
    <ControlTheme
        x:Key="DateTimePickerItem"
        BasedOn="{StaticResource {x:Type ListBoxItem}}"
        TargetType="ListBoxItem">
        <Setter Property="ListBoxItem.CornerRadius" Value="0" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="Background" Value="{DynamicResource DateTimePickerListItemBackground}" />

        <Style Selector="^:selected">
            <Setter Property="IsHitTestVisible" Value="False" />
        </Style>
        <Style Selector="^.MonthItem">
            <Setter Property="Padding" Value="{DynamicResource DatePickerFlyoutPresenterMonthPadding}" />
            <Setter Property="HorizontalContentAlignment" Value="Left" />
        </Style>
    </ControlTheme>

    <!--  This is used for both the accept/dismiss & buttons in the presenter  -->
    <ControlTheme x:Key="DateTimePickerButton" TargetType="Button">
        <Setter Property="Foreground" Value="{DynamicResource DateTimePickerFlyoutButtonForeground}" />
        <Setter Property="Background" Value="{DynamicResource DateTimePickerFlyoutButtonBackground}" />
        <Setter Property="Padding" Value="0 8" />
        <Setter Property="CornerRadius" Value="0" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Template">
            <ControlTemplate TargetType="Button">
                <Border Background="{TemplateBinding Background}">
                    <ContentPresenter
                        x:Name="ContentPresenter"
                        Padding="{TemplateBinding Padding}"
                        HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                        VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                        Background="{TemplateBinding Background}"
                        Content="{TemplateBinding Content}"
                        ContentTemplate="{TemplateBinding ContentTemplate}"
                        CornerRadius="{TemplateBinding CornerRadius}"
                        Foreground="{TemplateBinding Foreground}" />
                </Border>
            </ControlTemplate>
        </Setter>

        <Style Selector="^:pointerover /template/ ContentPresenter">
            <Setter Property="Foreground" Value="{DynamicResource DateTimePickerFlyoutButtonPointeroverForeground}" />
            <Setter Property="Background" Value="{DynamicResource DateTimePickerFlyoutButtonPointeroverBackground}" />
        </Style>

        <Style Selector="^:pressed /template/ ContentPresenter">
            <Setter Property="Foreground" Value="{DynamicResource DateTimePickerFlyoutButtonPressedForeground}" />
            <Setter Property="Background" Value="{DynamicResource DateTimePickerFlyoutButtonPressedBackground}" />
        </Style>
    </ControlTheme>

    <ControlTheme
        x:Key="DateTimePickerUpButton"
        BasedOn="{StaticResource DateTimePickerButton}"
        TargetType="RepeatButton">
        <Setter Property="VerticalAlignment" Value="Top" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="IsVisible" Value="False" />
        <Setter Property="Padding" Value="0 4" />
        <Setter Property="Content">
            <Template>
                <PathIcon
                    Width="8"
                    Height="8"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Data="{DynamicResource DateTimePickerButtonUpGlyph}"
                    Foreground="{Binding $parent[ContentPresenter].Foreground}" />
            </Template>
        </Setter>
    </ControlTheme>

    <ControlTheme
        x:Key="DateTimePickerDownButton"
        BasedOn="{StaticResource DateTimePickerButton}"
        TargetType="RepeatButton">
        <Setter Property="VerticalAlignment" Value="Bottom" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="IsVisible" Value="False" />
        <Setter Property="Padding" Value="0 4" />
        <Setter Property="Content">
            <Template>
                <PathIcon
                    Width="8"
                    Height="8"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Data="{DynamicResource DateTimePickerButtonDownGlyph}"
                    Foreground="{Binding $parent[ContentPresenter].Foreground}" />
            </Template>
        </Setter>
    </ControlTheme>
</ResourceDictionary>