When I do that, my 'required' (from the required field validator) shows up in the middle of the textbox. It is no longer right after the textbox itself. I have attached an image.
<tr>
<td class="NormalPadding" width="15%">Donation Purpose<font color="red">*</font></td>
<td>
<telerik:RadTextBox ID="DonationPurpose" Skin="Web20" MaxLength="50" Columns="30" runat="server" TabIndex="1" ToolTip="A short description of the donation purpose"/>
<asp:requiredfieldvalidator ID="rfvDonationPurpose" cssclass="Normal" controltovalidate="DonationPurpose" errormessage="Required." display="dynamic" runat="server" /></td></tr>