I can to This?

When I create Combo from XML. I can use “setComboText”. Why ?

Probably, you  have meant that you  can NOT set combo text ?

If so it is possible that you use tried to use this method before xml loading is ended.

Please, try to use the following:

combo.loadXML(“some.xml”,doAfterLoading);

funciton doAfterLoading(){
       combo.setComboText(“some text”);
}