wpf-notifyicon/src/NotifyIconWpf.Sample.ShowCases/Tutorials/02 - ToolTips/InlineToolTipWindow.xaml

<Window
    x:Class="NotifyIconWpf.Sample.ShowCases.Tutorials.InlineToolTipWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:tb="http://www.hardcodet.net/taskbar"
    Height="300"
    Width="300">
    <Grid>

        <tb:TaskbarIcon
            x:Name="MyNotifyIcon"
            IconSource="/Icons/Error.ico"
            ToolTipText="hello world">

            <!--
        We can use arbitrary UI elements as ToolTips.
        Let's use a semi-transparent border.
      -->
            <tb:TaskbarIcon.TrayToolTip>
                <Border
                    Background="White"
                    BorderBrush="Orange"
                    BorderThickness="2"
                    CornerRadius="4"
                    Opacity="0.8"
                    Width="160"
                    Height="40">
                    <TextBlock
                        Text="hello world"
                        HorizontalAlignment="Center"
                        VerticalAlignment="Center" />
                </Border>
            </tb:TaskbarIcon.TrayToolTip>

        </tb:TaskbarIcon>
        <TextBlock Margin="26,26,24,0" VerticalAlignment="Top" FontWeight="Bold" TextWrapping="Wrap">
            <Run Text="Move mouse over NotifyIcon to show ToolTip" Language="de-ch" />
        </TextBlock>

    </Grid>
</Window>