msfs-popout-panel-manager/MainApp/AppWindow/NumPad.xaml

<Window
    x:Class="MSFSPopoutPanelManager.MainApp.AppWindow.NumPad"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:viewModel="clr-namespace:MSFSPopoutPanelManager.MainApp.ViewModel"
    Title="Virtual NumPad"
    Width="300"
    Height="400"
    ResizeMode="CanResize"
    WindowStyle="None"
    mc:Ignorable="d">
    <Window.Resources>
        <Style TargetType="{x:Type Button}">
            <Setter Property="FontSize" Value="14" />
            <Setter Property="FontWeight" Value="Bold" />
            <Setter Property="Foreground" Value="White" />
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border
                            Background="{TemplateBinding Background}"
                            BorderBrush="Gray"
                            BorderThickness="1">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="Transparent" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <EventSetter Event="Click" Handler="Button_Click" />
        </Style>
    </Window.Resources>
    <materialDesign:ColorZone
        HorizontalAlignment="Stretch"
        VerticalAlignment="Stretch"
        Mode="Dark">
        <Grid d:DataContext="{d:DesignInstance viewModel:NumPadViewModel}">
            <Grid.RowDefinitions>
                <RowDefinition Height="35" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <TextBlock
                Grid.Row="0"
                Grid.Column="0"
                Grid.ColumnSpan="3"
                Margin="10,0"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Foreground="White">
                Virtual NumPad
            </TextBlock>
            <Button
                x:Name="BtnClose"
                Grid.Row="0"
                Grid.Column="3"
                Width="28"
                Height="28"
                Margin="5,0"
                HorizontalAlignment="Right"
                VerticalAlignment="Center"
                Click="BtnClose_Click"
                Foreground="White"
                Style="{StaticResource MaterialDesignIconButton}"
                ToolTip="Close NumPad">
                <materialDesign:PackIcon Kind="Close" />
            </Button>
            <Button
                x:Name="BtnTab"
                Grid.Row="1"
                Grid.Column="0"
                Content="Tab" />
            <Button
                x:Name="BtnDivide"
                Grid.Row="1"
                Grid.Column="1"
                Content="/" />
            <Button
                x:Name="BtnMultiply"
                Grid.Row="1"
                Grid.Column="2"
                Padding="0,8,0,0"
                Content="*" />
            <Button
                x:Name="BtnSubtract"
                Grid.Row="1"
                Grid.Column="3"
                Content="-" />
            <Button
                x:Name="Btn7"
                Grid.Row="2"
                Grid.Column="0"
                Content="7" />
            <Button
                x:Name="Btn8"
                Grid.Row="2"
                Grid.Column="1"
                Content="8" />
            <Button
                x:Name="Btn9"
                Grid.Row="2"
                Grid.Column="2"
                Content="9" />
            <Button
                x:Name="BtnAdd"
                Grid.Row="2"
                Grid.RowSpan="2"
                Grid.Column="3"
                Content="+" />
            <Button
                x:Name="Btn4"
                Grid.Row="3"
                Grid.Column="0"
                Content="4" />
            <Button
                x:Name="Btn5"
                Grid.Row="3"
                Grid.Column="1"
                Content="5" />
            <Button
                x:Name="Btn6"
                Grid.Row="3"
                Grid.Column="2"
                Content="6" />
            <Button
                x:Name="Btn1"
                Grid.Row="4"
                Grid.Column="0"
                Content="1" />
            <Button
                x:Name="Btn2"
                Grid.Row="4"
                Grid.Column="1"
                Content="2" />
            <Button
                x:Name="Btn3"
                Grid.Row="4"
                Grid.Column="2"
                Content="3" />
            <Button
                x:Name="BtnEnter"
                Grid.Row="4"
                Grid.RowSpan="2"
                Grid.Column="3"
                Content="Ent" />
            <Button
                x:Name="Btn0"
                Grid.Row="5"
                Grid.Column="0"
                Grid.ColumnSpan="2"
                Content="0" />
            <Button
                x:Name="BtnDecimal"
                Grid.Row="5"
                Grid.Column="2"
                Content="." />
        </Grid>
    </materialDesign:ColorZone>
</Window>