PhoneTextBox是增强文本框的早期预览，支持操作图标和水印等特性。

PhoneTextBox is an early look at an enhanced text box with action icon support, watermarking, etc.

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当我们缩小浏览器尺寸时，带水印的文本框和搜索按钮会保持同样的尺寸，因为其grid容器列的宽度是固定的。

When we shrink the browser, the watermark textbox and search button stay the same size because their Grid container columns are a fixed width.

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