bo/Workbench/QMonitor/qmonlib.ui/Views/Monitor/MonitoCaptionView.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"
             mc:Ignorable="d" d:DesignWidth="400" d:DesignHeight="45"
             x:Class="qmonlib.ui.Views.Monitor.MonitoCaptionView">
  <Border 
      Margin="1"
      Padding="1"
      BorderThickness="2"
      >
          <Grid>
              <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="*"/>
                  <ColumnDefinition Width="16"/>
              </Grid.ColumnDefinitions>
              <Grid.RowDefinitions>
                  <RowDefinition Height="*"/>
              </Grid.RowDefinitions>     
              
              <TextBlock 
                  Foreground="White" 
                  Text="MyCaption is dome" 
                  Grid.Column="0"
                  Grid.Row="0"
                  />
              <Button Grid.Column="1"
                      Grid.Row="0"
                      >
                <Button.Content>
                    <TextBlock Foreground="White" Text="ffeeeeeeeee"></TextBlock>
                </Button.Content>
              </Button>
      </Grid>
  </Border>
</UserControl>