Add space between TableViewRow

How to add space between each TableViewRow for tableview

Window.Js

for(var i=0;i < benefitElection.length ;i++){
//  
    tblRow_Election[i] = Titanium.UI.createTableViewRow({
        height:(Ti.Platform.osname == 'ipad')?'280':'140',
        width:Titanium.Platform.displayCaps.platformWidth,
        left:(Ti.Platform.osname == 'ipad')?'20':'10',
        right:(Ti.Platform.osname == 'ipad')?'20':'10',
        color:'red',
        touchEnabled: true, 
        borderRadius:'4',
        borderWidth:'1',
        borderColor:'green',
 
    }); 
 
        data.push(tblRow_Election[i]);
}
 
    $.tbl_ElectionList.data = data;

"#tbl_ElectionList":{
 
    top:'40',
    height:'auto',
    backgroundColor:'transparent',
    left:'10',
    right:'10', 
    style:Titanium.UI.iPhone.TableViewStyle.GROUPED,
    borderColor:'green',
    separatorInsets: {
      left:0,
      right:0,
  },
}

<Alloy>
    <Window id="ElectionWin" class="ElectionWindow" >
        <View class="container" id = "view_Election" backgroundColor="white">
            <TableView id="tbl_ElectionList">
            </TableView>    
    </View>
    </Window>
</Alloy>