Libation/Source/LibationAvalonia/Controls/DirectoryOrCustomSelectControl.axaml

<UserControl 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"
             xmlns:controls="clr-namespace:LibationAvalonia.Controls"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="LibationAvalonia.Controls.DirectoryOrCustomSelectControl">
	
    <Grid
        RowDefinitions="Auto,Auto,Auto"
        ColumnDefinitions="Auto,*,Auto">

        <RadioButton
            Grid.RowSpan="2"
            Name="rbKnown" />

        <TextBlock
            Grid.Column="1"
            Grid.ColumnSpan="2"
            VerticalAlignment="Center"
            Margin="10,0"
            IsEnabled="False"
            IsVisible="{Binding #cmbKnownDirs.SelectedItem, Converter={x:Static ObjectConverters.IsNull}}"
            Text="Select Known Directory:" />

		<controls:WheelComboBox
            Grid.Column="1"
            Grid.ColumnSpan="2"
            HorizontalAlignment="Stretch"
            Margin="0,0,0,3"
            IsEnabled="{Binding #rbKnown.IsChecked}"
            Name="cmbKnownDirs" />

        <TextBox
            Grid.Row="1"
            Grid.Column="1"
            Grid.ColumnSpan="2"
            IsReadOnly="True"
            Margin="0,0,0,8"
            Name="tboxKnownDirPath"
            IsEnabled="{Binding #rbKnown.IsChecked}"
            Text="{Binding #cmbKnownDirs.SelectedItem.Directory}" />

        
        <RadioButton
            Grid.Row="2"
            Name="rbCustom" />

        <TextBox
        Grid.Row="2"
            Grid.Column="1"
            HorizontalAlignment="Stretch"
            Name="tboxCustomDirPath"
            Margin="0,0,10,0"
            VerticalAlignment="Center"
            Text="{Binding $parent[1].Directory, Mode=OneWayToSource}"
            IsEnabled="{Binding #rbCustom.IsChecked}"/>

        <Button
             Grid.Row="2"
             Grid.Column="2"
             Name="btnBrowse"
             IsEnabled="{Binding #rbCustom.IsChecked}">
                <TextBlock Text="..." />
        </Button>

    </Grid>
</UserControl>