App Theme With buttons

using the Wisej.ThemeBuilder , i saw that there is the option to add appearance(Style) to the App theme and use it in the entire application

like Gizmox.

The thing that i don’t understand is how to apply my own style for elements(for example buttons)

and how to use the Button-Ok/Alert/Error Style in my App.

in Gizmox there were the CustomStyle property to load the customStyle into the Element.

Thanks for your help

Orel.