Avalonia/samples/ControlCatalog/Pages/ButtonSpinnerPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.ButtonSpinnerPage"
             xmlns:sys="clr-namespace:System;assembly=netstandard">

  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Classes="h1">ButtonSpinner</TextBlock>
    <TextBlock Classes="h2">The ButtonSpinner control allows you to add button spinners to any element and then respond to the Spin event to manipulate that element.</TextBlock>

    <StackPanel Orientation="Vertical" Spacing="8" Width="200" Margin="0,20,0,0">
      <CheckBox Name="allowSpinCheck" IsChecked="True">AllowSpin</CheckBox>
      <CheckBox Name="showSpinCheck" IsChecked="True">ShowButtonSpinner</CheckBox>
      <ButtonSpinner Spin="OnSpin" Height="30"
                     AllowSpin="{Binding #allowSpinCheck.IsChecked}"
                     ShowButtonSpinner="{Binding #showSpinCheck.IsChecked}">
        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Everest"/>
      </ButtonSpinner>
      <ButtonSpinner Spin="OnSpin" Height="30" ButtonSpinnerLocation="Left"
                     AllowSpin="{Binding #allowSpinCheck.IsChecked}"
                     ShowButtonSpinner="{Binding #showSpinCheck.IsChecked}">
        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Everest"/>
      </ButtonSpinner>
      <ButtonSpinner MinHeight="30" Spin="OnSpin" ButtonSpinnerLocation="Left"
                     AllowSpin="{Binding #allowSpinCheck.IsChecked}"
                     ShowButtonSpinner="{Binding #showSpinCheck.IsChecked}">
        <DataValidationErrors.Error>
          <sys:Exception /> 
        </DataValidationErrors.Error>
        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Everest"/>
      </ButtonSpinner>
    </StackPanel>
  </StackPanel>

</UserControl>