ModsPage.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:JustLauncher.Controls"
             xmlns:loc="clr-namespace:JustLauncher.Resources"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="JustLauncher.ModsPage">
    <Grid RowDefinitions="*" Margin="40">
        <!-- Mods Control -->
        <Border Grid.Row="0" Background="{DynamicResource ContentBackground}" CornerRadius="8" Padding="20">
            <controls:ModsControl x:Name="ModsControl"/>
        </Border>
    </Grid>
</UserControl>