Tab index is not reset if change hanlder triggers further actions

[cplaetzinger]

The tab index of the selected value is set to -1 once the gwtchosen gets the focus. It is set back to the original value once the focus is lost. This does not work if a change handler is used. In my case the change handler triggers e.g. some communication with the server and updates of other ui components.
Maybe the tab index should be reset to the original value once the dropdown is hidden.