How to work with RadioGroup in RibbonControl in WI

Hi, I need RadioButton on Ribbon Control so I used RadioGroup and created event selectedIndexChanged, In which I performed some tasks

 private void repositoryItemRadioGroup1_SelectedIndexChanged(object sender, EventArgs e)
    {
        RadioGroup rg = (RadioGroup)sender;
        int index = rg.SelectedIndex;

        if (index == 0)
        {
             // code
        }
        if (index == 1)
        {
           // code              
        }
        if (index == 2)
        {
           // code       
        }
        else if (!(index == 2) || !(index == 1))
        {
           // code
        }
    }

Till now the code work fine.in beforeLeaveRow event I am performing some calculations but I need to perform the calculations based on the Radio Button Selected so I need to get that Selected Radio Button and then perform calculations based on what I selected.

private void gridView1_BeforeLeaveRow(object sender, DevExpress.XtraGrid.Views.Base.RowAllowEventArgs e)
    {          
        decimal a = Convert.ToDecimal(TXE_SubTotal.Text);
        decimal b = Convert.ToDecimal(TXE_Shipping.Text);
        decimal c = Convert.ToDecimal(TXE_Tax.Text);
        decimal d = Convert.ToDecimal(TXE_Discount.Text);
        if(RadioGroup.index==0)
        {
        total = ((a + b + c) - d).ToString("n2"); 
        }
        else if(RadioGroup.index==1)
        {
         total = (a + b + c).ToString("n2");
        }
    }

I need to perform calculations like this. Help me complete my task. How to get Selected RadioIndex or something ??

Thanks in advance.

Following is desired code:

repositoryItemRadioGroup1.Items.AddRange(new RadioGroupItem[] 
{
     new RadioGroupItem(1, "Item1"),
     new RadioGroupItem(2, "Item2")
});

private void gridView1_BeforeLeaveRow(object sender, DevExpress.XtraGrid.Views.Base.RowAllowEventArgs e)
{ 
    if(barEditItemRadio.EditValue==null)
       return;//Or do whatever 
    int editValue = (int)barEditItemRadio.EditValue;
    if(editValue ==1)//Item1 is selected 
    {
    total = ((a + b + c) - d).ToString("n2"); 
    }
    else if(editValue ==2)//Item2is selected 
    {
     total = (a + b + c).ToString("n2");
    }
}