Semi.Avalonia/src/Semi.Avalonia.Demo/MainWindow.axaml

<Window
    x:Class="Semi.Avalonia.Demo.MainWindow" 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:pages="using:Semi.Avalonia.Demo.Pages"
    Title="Semi.Demo" d:DesignHeight="450"
    d:DesignWidth="800" mc:Ignorable="d">
    <TabControl TabStripPlacement="Left">
        <TabItem Header="TextBlock">
            <pages:TextBlockDemo />
        </TabItem>
        <TabItem Header="Button">
            <pages:ButtonDemo />
        </TabItem>
        <TabItem Header="CheckBox">
            <pages:CheckBoxDemo />
        </TabItem>
        <TabItem Header="RadioButton">
            <pages:RadioButtonDemo />
        </TabItem>
        <TabItem Header="Label">
            <pages:LabelDemo />
        </TabItem>
        <TabItem Header="Border">
            <pages:BorderDemo />
        </TabItem>
    </TabControl>
</Window>