I used two ext:RadioGroup and only one Radio Button in the specified group should be selected at a time. So I set the GroupName="reportType".
    <P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none"><ext:ColumnLayout ID="ColumnLayout5" runat="server"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">              <ext:LayoutColumn ColumnWidth="0.5"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                <ext:Panel ID="Panel1" runat="server" Border="false"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    <Body><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        <ext:RadioGroup ID="RadioGroup1" runat="server" ColumnsNumber="1" GroupName="reportType"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                            <Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                <ext:RadioColumn ID="RadioColumn1"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                    <Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                        <ext:Label ID="lblRadioGroup1" runat="server" Text="RadioGroup1"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                        </ext:Label><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                    </Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                </ext:RadioColumn><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                            </Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        </ext:RadioGroup><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    </Body><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                </ext:Panel><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            </ext:LayoutColumn><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            <ext:LayoutColumn ColumnWidth="0.5"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                <ext:Panel ID="Panel2" runat="server" Border="false"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    <Body><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        <ext:RadioGroup ID="RadioGroup2" runat="server" ColumnsNumber="1" GroupName="reportType"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                            <Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                <ext:RadioColumn ID="RadioColumn2"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                    <Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                        <ext:Label ID="lblRadioGroup2" runat="server" Text="RadioGroup2"><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                        </ext:Label><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                    </Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                                </ext:RadioColumn><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                            </Items><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        </ext:RadioGroup><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    </Body><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                </ext:Panel><P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            </ext:LayoutColumn>   </ext:ColumnLayout>
<P class=MsoNormal style="MARGIN: 0in 0in 10pt">
<P class=MsoNormal style="MARGIN: 0in 0in 10pt">I had to add radios dynamically for each radio groups. 
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            case 1:<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                RadioColumn1.Items.Add(new Radio { ID = type.ReportTypeId.ToString(), BoxLabel = type.TypeName, Checked = false});<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                break;<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            case 2:<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                RadioColumn12.Items.Add(new Radio { ID = type.ReportTypeId.ToString(), BoxLabel = type.TypeName, Checked = false });<P class=MsoNormal style="MARGIN: 0in 0in 10pt">                break;


It is working fine and populated all radios. I want to retrieve the box label of checked radio. I tried to retrieve it by using following method and it won?t show the Items which dynamically added.
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">[AjaxMethod]<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">    public void test()<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">    {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        try<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            List<RadioGroup> groups = Coolite.Utilities.ControlUtils.FindControls<RadioGroup>(this);<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        foreach (RadioGroup group in groups)<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            foreach (RadioColumn column in group.Items)<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                foreach (Radio radio in column.Items)<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    if (radio.Checked)<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        string s = radio.BoxLabel.ToString();<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                        break;<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                    }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">                }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">            }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none"> <P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none"> <P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        catch(Exception ex)<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        {<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">        }<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none"> <P class=MsoNormal style="MARGIN: 0in 0in 10pt">    }<P class=MsoNormal style="MARGIN: 0in 0in 10pt">


<P class=MsoNormal style="MARGIN: 0in 0in 10pt">Please help.<P class=MsoNormal style="MARGIN: 0in 0in 10pt">









</PRE></PRE>