How to set the window frame icon of javafx.scene.control.Alert ?

Hi,
I am looking into using the new Java 8u40 Alert Dialogs (javafx.scene.control.Alert) and I am struggling with setting custom (application) icons for the window / stage.
I mean that icon, which appears in the upper left corner (on Windows OS) of the window frame, which you can set for normal stages with
javafx.stage.Stage.getIcons()
Similarily I want to apply a custom stylesheet to the Alert.
How can I do this?
Is it really only this way?
((Stage)alert.getDialogPane().getScene().getWindow()).getIcons().add(...) ?

I think you already have the recommended way to set an icon for Java 8u40. Maybe some future Java version might add some additional API to make it a little bit less clunky, but for now, just go with the same code you have:
((Stage)alert.getDialogPane().getScene().getWindow()).getIcons().add(...) ?
It is the same technique used in:
javafx - How do you set the icon of a Dialog control Java FX/Java 8 - Stack Overflow
and in makery's dialog tutorial:
JavaFX Dialogs (official) | code.makery.ch

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