如何在WPF中鼠标悬停时显示悬停信息气泡？

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
       <Button Content="Hover over me">
           <Button.ToolTip>
                <ToolTip Content="This is a tooltip!"/>
            </Button.ToolTip>
        </Button>
    </Grid>
</Window>

Button button = new Button();
button.Content = "Hover over me";

ToolTip toolTip = new ToolTip();
toolTip.Content = "This is a tooltip!";

button.ToolTip = toolTip;