D&D an AP.
D&D a Button.
Set an inline style on the Button of '-fx-alignment: 10' an error is shown in the message panel but - bug - the content panel renders incorrectly (see screenshot) and NB outputs the following:

Feb 13, 2014 12:17:46 PM com.sun.javafx.css.parser.CSSParser term
WARNING: CSS Error parsing in-line style '-fx-alignment: ;' from com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.StyleEditor$StyleableStub@47544f15: Unexpected token ';' at [1,15]