ProfileSelectionWindow.xaml

<Window x:Class="XColumn.ProfileSelectionWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ui="http://schemas.modernwpf.com/2019"
        Title="プロファイル選択" Height="240" Width="350"
        WindowStartupLocation="CenterOwner" ResizeMode="NoResize"
        ShowInTaskbar="False"
        ui:WindowHelper.UseModernWindowStyle="True"
        Background="{DynamicResource SystemControlPageBackgroundChromeLowBrush}">

    <StackPanel Margin="15">
        <TextBlock Name="MessageText" 
                   Text="対象のプロファイルを選択してください:" 
                   Margin="0,0,0,10" TextWrapping="Wrap" 
                   Foreground="{DynamicResource SystemControlPageTextBaseHighBrush}"/>

        <ComboBox Name="ProfileCombo" 
                  DisplayMemberPath="Name" 
                  Margin="0,0,0,20" Padding="5" Height="32"
                  VerticalContentAlignment="Center"/>

        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
            <Button Content="キャンセル" IsCancel="True" Width="90" Margin="0,0,10,0" Padding="5"/>
            <Button Name="ActionButton" Content="OK" IsDefault="True" Click="OkButton_Click" Width="90" Padding="5" FontWeight="Bold"/>
        </StackPanel>
    </StackPanel>
</Window>