Anko borderless button

inline fun ViewManager.styledButton(styleRes: Int = 0, init: Button.() -> Unit): Button = ankoView({
            if (styleRes == 0) Button(it)
            else Button(ContextThemeWrapper(it, styleRes), null, 0)
        }, 0, init)

use

styledButton(R.style.Widget_AppCompat_Button_Borderless) {
    textResource = android.R.string.ok
}