Use 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>
Related examples in the same category