您可以将几乎所有内容放入工具提示中，这是一个使用TextBlock的示例粗体文字。

You can put almost anything into a tooltip, here is an example that uses a TextBlock with some bold text.

<Button Content="Button" Margin="251,210,257,188" >
      <ToolTipService.ToolTip>
        <TextBlock><Run Text="Non bold text, this is "/><Run FontWeight="Bold" Text="bold."/></TextBlock>
      </ToolTipService.ToolTip>
    </Button>