Avalonia/samples/ControlCatalog/Pages/AutoCompleteBoxPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.AutoCompleteBoxPage">
  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Classes="h1">AutoCompleteBox</TextBlock>
    <TextBlock Classes="h2">A control into which the user can input text</TextBlock>

    <StackPanel Orientation="Horizontal"
              Margin="0,16,0,0"
              HorizontalAlignment="Center"
              Spacing="8">
      <StackPanel Orientation="Vertical">
        <TextBlock Text="MinimumPrefixLength: 1"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         MinimumPrefixLength="1"/>
        <TextBlock Text="MinimumPrefixLength: 3"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         MinimumPrefixLength="3"/>
        <TextBlock Text="MinimumPopulateDelay: 1 Second"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         MinimumPopulateDelay="1"/>
        <TextBlock Text="MaxDropDownHeight: 60"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         MaxDropDownHeight="60"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         Watermark="Watermark"/>
        <TextBlock Text="Disabled"/>
        <AutoCompleteBox Width="200"
                         IsEnabled="False"/>
      </StackPanel>
      

      <StackPanel Orientation="Vertical">
        
        <TextBlock Text="ValueMemeberSelector"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         ValueMemberSelector="Capital"/>
        <TextBlock Text="ValueMemberBinding"/>
        <AutoCompleteBox Width="200"
                         Margin="0,0,0,8"
                         ValueMemberBinding="{Binding Capital}"/>
        <TextBlock Text="Multi-Binding"/>
        <AutoCompleteBox Name="MultiBindingBox"
                         Width="200"
                         Margin="0,0,0,8"
                         FilterMode="Contains"/>
        <TextBlock Text="Async Populate"/>
        <AutoCompleteBox Name="AsyncBox"
                         Width="200"
                         Margin="0,0,0,8"
                         FilterMode="None"/>
      </StackPanel>
    </StackPanel>
  </StackPanel>
</UserControl>