This is the easiest and shortest tip so far. If you want to do any of the following things:

• learn how to use CSS
• make your custom controls look like the standard controls
• reuse an SVG path graphic used by a standard control (e.g. scrollbar arrows)
• figure out how to navigate the structure of the standard controls
• determine the color used for a specific item
• consistently modify several standard controls

then simply take a look at the default CSS stylesheet that ships with JavaFX. The file is called modena.css and can be found in the jfxrt.jar file in this location: com/sun/javafx/scene/control/skin/modena/.