В FW1.1 не проверял, но для FW2
<asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatColumns="2" RepeatDirection="Horizontal"
Width="1px">
<asp:ListItem>qweqwe</asp:ListItem>
<asp:ListItem>234524</asp:ListItem>
<asp:ListItem>qwerqwer</asp:ListItem>
<asp:ListItem>qqqqq</asp:ListItem>
<asp:ListItem>3222q34</asp:ListItem>
<asp:ListItem>qwersdfq</asp:ListItem>
</asp:RadioButtonList>

----------------------------------------
Knowledge is P...O...w...E...R!
My site