represent option of combobox
Content of tag used as option label

Attributes

value - value of option

css - styles of option

img_src - image for combo with images

value for related option
if skipped - value will be set the same as option's label
can contain any HTML, while it correctly escaped

any css text, which need to be applied to option in question

for combo with images , this attribute contains url to image related to option ( if none set, default image will be used )
has no sense for combo in default mode ( without images )

just top xml tag, has no special meaning

Optional attributes

add - set mode of options adding

If attribute exists - options from XML will be added to existing list,
in other case, all previous options will be deleted