Today at JavaOne, Gerrit Grunwald, the senior software engineer of Canoo Engineering AG, will give a presentation titled Be Creative and Create Your Own JavaFX 8 Controls.
This session is supposed to demonstrate various ways to create custom controls including extending an existing control, extending a region, or creating a more library-style control with custom control, skin, behavior, and CSS file. It also will show how to avoid some common performance problems.
You can learn some additional tips for customization of UI controls from the JavaFX UI Controls tutorial. Also, see Skinning JavaFX Applications with CSS and the JavaFX CSS Reference Guide for more information about available CSS styles and how to apply them to JavaFX application UI.