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Get the id of current selected item in ComboBox

How can i get the selected item's id(not the displayed text value but the key) of a diji.form.ComboBox?
I searched in the web and this forum for about 1 days, but neither have the solution.
My data store for the ComboBox is as follows:
{identifier:"name",
items: [
{name:"China", label:"Ch"},
{name:"USA", label:"US"}
]}
and I want to get the label "Ch" or "US". However, when using the getValue(), i always get the "China" and "USA".
BTW, i can not use the FilteringSelect, and the method as digit.byId(’myCombo’).comboBoxSelectionValue.value seems not working in the dojo 1.1.

Thanks in advance!