Format text and color of close options in confirm, alert, and carousel window styles

[wayfaringrob]

I'd like to have the ability to change the color of the buttons as well as the text in the Alert style's buttons. Currently they default to Esri blue/white, and Alert is fixed with OK/Cancel options. Seems odd that you can customize everything but these buttons.

[ArianaToth]

Right now, in order to change the text color, I have to change the Dark color in my theme's style, but that changes other elements that I do not want changed. I have set a background to my window that makes the font impossible to read using the same color as is applied to all other Dark theme elements in my app. But if I change the Dark theme color, those other elements become unreadable. 

I would like to be able to change both the outline for the checkbox and the confirmation text so I don't end up with this: