How to use a tooltip in WPF

The following XAML code adds a tooltip to a TextBox control. Using the same approach, you can apply tooltips to any control in WPF.

 <TextBox HorizontalAlignment="Left">ToolTip with non-text content
     <TextBox.ToolTip>
    <ToolTip>
           <DockPanel Width="50" Height="70">
             <Image Source="data\flower.jpg"/>
             <TextBlock>Useful information goes here.</TextBlock>
           </DockPanel>
        </ToolTip>
     </TextBox.ToolTip>
</TextBox>