zIndex issues between two ASPxDockPanel

Question

I have two ASPxDockPanels in the same ASPxDockZone (vertical). The first panel has an ASPxCombobox with a dropdownlist that should go over the second panel. However the dropdownlist is just rendered behind the second panel.

First panel has a z-index of 12000 while the second has a z-index of 12002 which explain the issue, so I tried to apply a CssClass property at each panels as suggested on devexpress website but it still didn't work.

Thanks in advance for your help, TheRainFall.

Answer 1

Had my answer from DevXpress support.

It is related to IE z-index bug (IE7). Since I'm using IIS 6, the basic compatibility mode seems to be set on IE7 although users are using IE8.