Avalonia/samples/BindingTest/MainWindow.paml

<Window xmlns="https://github.com/perspex"
        xmlns:vm="clr-namespace:BindingTest.ViewModels;assembly=BindingTest">
  <TabControl>
    <TabItem Header="Basic">
      <StackPanel Orientation="Horizontal">
        <StackPanel Margin="18" Gap="4" Width="200">
          <TextBlock FontSize="16" Text="Simple Bindings"/>
          <TextBox Watermark="Two Way" UseFloatingWatermark="True" Text="{Binding StringValue}"/>
          <TextBox Watermark="One Way" UseFloatingWatermark="True" Text="{Binding Path=StringValue, Mode=OneWay}"/>
          <TextBox Watermark="One Time" UseFloatingWatermark="True" Text="{Binding Path=StringValue, Mode=OneTime}"/>
          <TextBox Watermark="One Way To Source" UseFloatingWatermark="True" Text="{Binding Path=StringValue, Mode=OneWayToSource}"/>
        </StackPanel>
        <StackPanel Margin="18" Gap="4" Width="200">
          <TextBlock FontSize="16" Text="Collection Bindings"/>
          <TextBox Watermark="Items[1].StringValue" UseFloatingWatermark="True" Text="{Binding Items[1].StringValue}"/>
          <Button Command="{Binding ShuffleItems}">Shuffle</Button>
        </StackPanel>
        <StackPanel Margin="18" Gap="4" Width="200">
          <TextBlock FontSize="16" Text="Negated Bindings"/>
          <TextBox Watermark="Boolean String" UseFloatingWatermark="True" Text="{Binding BooleanString}"/>
          <CheckBox IsChecked="{Binding !BooleanString}">!BooleanString</CheckBox>
          <CheckBox IsChecked="{Binding !!BooleanString}">!!BooleanString</CheckBox>
        </StackPanel>
      </StackPanel>
    </TabItem>
    <TabItem Header="ListBox">
      <StackPanel Orientation="Horizontal">
        <StackPanel.DataTemplates>
          <DataTemplate DataType="vm:TestItem">
            <TextBlock Text="{Binding StringValue}"/>
          </DataTemplate>
        </StackPanel.DataTemplates>
        <StackPanel Margin="18" Gap="4" Width="200">
          <TextBlock FontSize="16" Text="Multiple"/>
          <ListBox Items="{Binding Items}" SelectionMode="Multiple" SelectedItems="{Binding SelectedItems}"/>
        </StackPanel>
        <StackPanel Margin="18" Gap="4" Width="200">
          <TextBlock FontSize="16" Text="Multiple"/>
          <ListBox Items="{Binding Items}" SelectionMode="Multiple" SelectedItems="{Binding SelectedItems}"/>
        </StackPanel>
      </StackPanel>
    </TabItem>
  </TabControl>
</Window>