Hello everybody,
I have a ComboBox with data coming from a JsonStore.

A sample of data is this:
Code:
var datiCombo = [
        {"Fiume":"Chiascio","Comune":"Gubbio"},
        {"Fiume":"Tevere","Comune":"Perugia"},
        {"Fiume":"Tevere","Comune":"Roma"},
];
If I use the column "Fiume" for my ComboBox, I have got 2 entries "Tevere". Is there a way to populate ComboBox and show only unique values?

Thank you very much
Luca