Why the theme colors of a Theme.kt are not applyed...

# compose

[Pablo]

Why the theme colors of a Theme.kt are not applyed to a scaffold topappbar? I thought they apply to each composable but seems that not. If I add a topappbar without color defined, it seems to have a transparent background, default text color etc... How can I specify the topappbar colors in the theme? or maybe how can I tell the topappbar to use my theme colors? Thank you.