You can highlight your buttons in any colour you like. The default colour is orange, but here are a few examples that you could use (they all display this page)...
Default Orange Red Btn Yellow Btn Silver Btn White Btn
Each PopIT Window can open another PopIT Window... try it by clicking on the buttons in each window that appears. The buttons can of course each display different information, but this example serves to illustrate the full power of this feature.