ryujinx/Ryujinx.Ava/UI/Controls/InputDialog.axaml

<UserControl
    x:Class="Ryujinx.Ava.UI.Controls.InputDialog"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Focusable="True">
    <Grid
        Margin="5,10,5,5"
        HorizontalAlignment="Stretch"
        VerticalAlignment="Center">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <TextBlock HorizontalAlignment="Center" Text="{Binding Message}" />
        <TextBox
            Grid.Row="1"
            Width="300"
            Margin="10"
            HorizontalAlignment="Center"
            MaxLength="{Binding MaxLength}"
            Text="{Binding Input, Mode=TwoWay}" />
        <TextBlock
            Grid.Row="2"
            Margin="5,5,5,10"
            HorizontalAlignment="Center"
            Text="{Binding SubMessage}" />
    </Grid>
</UserControl>