Use Tooltip : ToolTip « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. ToolTip

<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Use Tooltip" Height="138" Width="300">
    <Grid>
        <Button Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="Button1" VerticalAlignment="Top" Width="75" ToolTip="This is a simple tooltip">Button</Button>
        <Button Height="23" HorizontalAlignment="Left" Margin="10,43,0,0" Name="Button2" VerticalAlignment="Top" Width="75" Content="Button">
            <Button.ToolTip>
                <ToolTip>
                    <StackPanel>
                        <TextBlock HorizontalAlignment="Left">This is a much more</TextBlock>
                        <TextBlock HorizontalAlignment="Center">
                            <Italic>
                                <Bold>elaborate</Bold>
                            </Italic>
                        </TextBlock>
                        <TextBlock HorizontalAlignment="Right">tooltip!</TextBlock>
                    </StackPanel>
                </ToolTip>
            </Button.ToolTip>
        </Button>
    </Grid>
</Window>

16.33.ToolTip
	16.33.1.	Add ToolTip to a Ellipse
	16.33.2.	Add ToolTip to a Rectangle
	16.33.3.	Display a Tool Tip on a Shape
	16.33.4.	Using LinearGradientBrush to paint ToolTip background
	16.33.5.	Display Graphics Elements in a Tool Tip
	16.33.6.	Display a Tool Tip on a Control
	16.33.7.	Use Tooltip