check 3.3.3. for me works fine in FF,IE and chrome.
I think it works fine by default if u don't specify custom z-index values or use at least z-index values lower than 1000 for the modal panel. This is because the combo box uses a z-index of 1000 to display the dropdown list. However, if u used a z-index greater than 1000 for your modal panel the comboBox will probably not work as it is hidden behind the modal panel. Therefore, I suggest two solutions:
1) Use z-index values lower than 1000 for your modal panel (and related components).
2) If u must or want to use a z-index >1000 for the modal panel, u can simply add a css value for ".rich-combobox-list-scroll" class with a greater value, e.g. if u have a z-index of 2000 for your modal panel, add:
That was the problem, I had the zindex on the modal panel set to 2000. Changing it to 500 fixed the problem. Thanks!