Tab indexing not working with MultiComboBoxItem

Hello

I'm working on setting tab indexes in a dynamic form. setTabIndex() and the setGlobalTabIndex() works fine with other types of form items like text box, drop down. But it
simply doesn't work with MultiComboBoxItem.

Could it be because of the following statement used in my code?
MultiComboBoxItem.setComboBoxProperties(ComboBoxIt em);

Can someone please let me know if tab indexing will work with MultiComboBoxItem

I'm using SmartGwt 3.1 and tested it on Firefox and IE.

Thanks in advance
Vasanth