Please note the following policy regarding the labelling of action buttons on dialogs and alerts, as described in http://www.xaraxtreme.org/developers/basics.html
“One of Xara's policies is to always make action buttons in dialogs use words that directly relate to what the button will do when clicked. This makes their action clearer to the user and makes it easier to phrase the question or message in the dialog.”
The alert recently added to LX asking the user whether they want to save the current design breaks this rule as it has Yes and No buttons, instead of “Save” and “Don’t Save” as in Xtreme. The fact that you can’t save the design no matter which button you choose is being addressed separately!