When it comes to the look-and-feel of the user interface, it's important to blend in nicely. Users are jarred by applications which contrast with the user interface they've come to expect. When designing your UIs, you should try and avoid rolling your own as much as possible. Instead, use a Theme. You can override or extend those parts of the theme that you need to, but at least you're starting from the same UI base as all the other applications. For all the details, read Applying Styles and Themes.
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