Import a style sheet
D&D a rect and make sure it remains selected
Add a style class
Type -fx-fill: green; into style and hit return (which should be a textarea and not a field btw)
Scroll up - the CSS button next to fill is undimmed (bug 1).
You are forced to deselect the rect and select it again - now the CSS button is dimmed (bug 2).
Now delete -fx-fill: green; from the style property and hit return to commit the change.
Scroll up - the CSS button next to fill is still dimmed (bug 3).
You are forced to deselect the rect and select it again - now the CSS button is undimmed (bug 4).