From Precision software & consulting:
With Precision NCA Components for VCL, you can extend the form with application button. These components are drawn directly to the non-client area of the target window, so they work fast. This component extends your form with so called "application button" that is usually displayed instead of the standard icon and the caption of the form. It allows you to change the caption-bar of your form to an interactive toolbar that can contain application button, quick access buttons, labels, and other custom drawn information.