Icon fonts on Titanium Alloy application Tabs

Hi all, I'm trying to add some iconic font to my first alloy application, on titanium 3.2.3, on Android platform. In particular, I'm able to place iconic fonts everywhere on the application but in Tabs. The index.xml part:

<Tab id="tab1" onClick="getNewsList"> 
   <Window id="readWin"> 
        <TableView id="tableView"/>
   </Window>                
</Tab>

"#tab1":{
       title:'',  
       color:'black',
       font: {
            fontSize: 24,
            fontFamily: 'FontAwesome',
        },
},

I've put the font file into app/assets/android/fonts , and If i put the same code in a label it correctly works. Are there any chances to set an icon font on a tab? I hope my question was correct and Thanks a lot!