I am using <rich:suggestionBox/> in a fairly standard way. My main problem is that the pop up still shows up when the suggestion list is empty or null. The other problem I have is that when the suggestion list is short and can't fill up the pop up, the background in the blank space is of a different color from the background of the suggestions. When I do a mouse over the suggestion items , the background color of the blank space changes to the background of the suggestion list.

My two questions are: (1) how do I prevent the pop up from showing when there is no suggestion? (2) how do I control the background color of the blank pop up?