Mirroring Custom Styles In TinyMCE Visual Mode

Is there anyway to force the TinyMCE editor to inherit custom styles?

It's confusing and annoying to add custom styles (such as H1) and not have them reflected in the visual editor. Once that starts happening, it's a guessing game what will actually render without previewing each & every change.

Worse, using any custom themes that change these styles blow the WYSIYG out of context too. Install a new theme and everything changes - except the visual editor preview.

Is there a way to import custom styles, or a plugin that adds custom styles to the visual editor window?

Thanks!

~ Corey