4.5: previewing bindings during editing?

In 4.4 UMG would run the binding functions during editing, while in 4.5 it doesn’t. I’m trying to create some reusable user-widgets for controls like buttons which have a “color” and “icon” variable, so I can easily add buttons to my screens without having to re-create their structure by hand every time.

However, I cannot preview my buttons during editing, since the bindings for “color” (applied to the button widget background color) and “icon” (applied to an image inside the button) are only executed during play and not during editing, compromising the WYSIWYG editing.