Lookless Controls
The goal of user controls is to provide a design surface that supplements the control template, giving you a quicker way to define the control at the price of future flexibility. This causes a problem if you're happy with the functionality of a user control, but you need to tailor its visual appearance. For example, imagine you want to use the same color picker but give it a different "skin" that blends better into an existing application window. You may be able to change some aspects of the user control through styles, but parts of it are locked away inside, hard-coded into the markup. For example, there's no way to move the preview rectangle to the left side of the sliders.
The solution is to create a lookless control—a control ...
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