How do I embed a dhtmlxCombo into a dhtmlxToolBar?
Currently there is no support for such kind of integration
Possible workaround may be in using label button and manual combo initialization in it
some.xml
    …
    <![CDATA[
        
]]>
…
toolbar.loadXML(“some.xml”,function(){
var combo = new dhtmlxCombo(“my_cont”);
…
})