I am currently working with GWT and the SuggestBox. The Suggestboxpopup is appearing behind the panel the Suggestbox is placed on. I am aware that there is an issue with the Suggestbox popup's z-index but I am looking to see if anyone has another solution other than hard-wiring the the z-index in the CSS.
The reason for this is the panel the suggest box is on has a Z-index helper which moves the panel to the front anytime it is clicked. While a super high z-index will resolve the issue i am wondering has anyone found a better solution which will allow the popup to move with the other widgets.
Yep, this is an known problem in SuggestBox which is in the issues list of GWT. It has been closed recently because of a lack of activity in the issue, you can put a comment to reopen it though.
I think it is not very important because no much apps need a suggest box on a popup.
I had the same issue in a project and I solved it with css as you suggest.