bloxstrap/Bloxstrap/Views/Pages/AppearancePage.xaml

<ui:UiPage x:Class="Bloxstrap.Views.Pages.AppearancePage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:Bloxstrap.Views.Pages"
      xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="AppearancePage"
      Scrollable="True">
    <StackPanel Margin="0,0,14,14">
        <TextBlock Text="Configure how Bloxstrap should look." FontSize="14" Foreground="{DynamicResource TextFillColorSecondaryBrush}" />

        <ui:CardControl Margin="0,8,0,0" Padding="16,13,16,12">
            <ui:CardControl.Header>
                <StackPanel>
                    <TextBlock FontSize="14" Text="Theme" />
                    <TextBlock Margin="0,2,0,0" FontSize="12" Text="Dark theme does not apply to Legacy or Vista styles." Foreground="{DynamicResource TextFillColorTertiaryBrush}" />
                </StackPanel>
            </ui:CardControl.Header>
            <ComboBox Width="200" Padding="10,5,10,5" ItemsSource="{Binding Themes.Keys, Mode=OneTime}" Text="{Binding Theme, Mode=TwoWay}" />
        </ui:CardControl>
        <ui:CardControl Margin="0,8,0,0" Padding="16,13,16,12">
            <ui:CardControl.Header>
                <StackPanel>
                    <TextBlock FontSize="14" Text="Style" />
                    <TextBlock Margin="0,2,0,0" FontSize="12" Text="Choose how the bootstrapper should look." Foreground="{DynamicResource TextFillColorTertiaryBrush}" />
                </StackPanel>
            </ui:CardControl.Header>
            <ComboBox Width="200" Padding="10,5,10,5" ItemsSource="{Binding Dialogs.Keys, Mode=OneTime}" Text="{Binding Dialog, Mode=TwoWay}" />
        </ui:CardControl>
        <ui:CardControl Margin="0,8,0,0" Padding="16,13,16,12">
            <ui:CardControl.Header>
                <StackPanel>
                    <TextBlock FontSize="14" Text="Icon" />
                    <TextBlock Margin="0,2,0,0" FontSize="12" Text="Choose what icon the bootstrapper should use." Foreground="{DynamicResource TextFillColorTertiaryBrush}" />
                </StackPanel>
            </ui:CardControl.Header>
            <Grid Width="200">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Border Grid.Column="0" Width="28" Height="28" Margin="0,0,5,0">
                    <Border.Background>
                        <ImageBrush ImageSource="{Binding IconPreviewSource, Mode=OneWay}" />
                    </Border.Background>
                </Border>
                <ComboBox Grid.Column="1" Margin="5,0,0,0" Padding="10,5,10,5" ItemsSource="{Binding Icons.Keys, Mode=OneTime}" Text="{Binding Icon, Mode=TwoWay}" />
            </Grid>
        </ui:CardControl>
        <ui:Button Content="Preview" HorizontalAlignment="Stretch" Margin="0,8,0,0" Command="{Binding PreviewBootstrapperCommand}" />
    </StackPanel>
</ui:UiPage>