ASP .net - autowrap on datagrid not working

Here is my code:

<ASP:TABLE id="tblApproval" runat="server" cssclass="meetinginfo" visible="False" cellspacing="0"
                        width="70%">
                        <ASP:TABLEROW>
                              <ASP:TABLECELL horizontalalign="Right">
                                    <ASP:LABEL id="lblApproval" runat="server"></ASP:LABEL>
                              </ASP:TABLECELL>
                        </ASP:TABLEROW>
                        <ASP:TABLEROW>
                              <ASP:TABLECELL>
                                    <ASP:DATAGRID id="dgApproval" runat="server" pagesize="15" width="75%" onitemdatabound="dgApproval_ItemDataBound"
                                          onpageindexchanged="Change_dgApproval" allowpaging="true" allowcustompaging="false" autogeneratecolumns="false"
                                          allowsorting="true" onsortcommand="Sort_dgApproval" onprerender="PreRender_dgApproval" ItemStyle-Wrap="True">
                                          <HEADERSTYLE forecolor="#FFFFFF" cssclass="dgHeader"></HEADERSTYLE>
                                          <PAGERSTYLE mode="NumericPages" HORIZONTALALIGN="Center" FORECOLOR="#FFFFFF" cssclass="dgPager"></PAGERSTYLE>
                                          <COLUMNS>
                                                <ASP:HYPERLINKCOLUMN headertext="Activity ID" datanavigateurlfield="MeetID" datanavigateurlformatstring="meetingdetail.aspx?m={0}"
                                                      datatextfield="MeetID" sortexpression="MeetID" />
                                                <ASP:BOUNDCOLUMN headertext="Location" datafield="Location" sortexpression="Location" readonly="True" />
                                                <ASP:BOUNDCOLUMN headertext="Brand" datafield="Product" sortexpression="Product" readonly="True" />
                                                <ASP:BOUNDCOLUMN headertext="Type" datafield="Type" sortexpression="Type" readonly="True" />
                                                <ASP:BOUNDCOLUMN headertext="Date" datafield="Date" dataformatstring="{0:MM/dd/yyyy}" sortexpression="Date"
                                                      readonly="True" />
                                                <ASP:BOUNDCOLUMN headertext="Territory" datafield="Territory" sortexpression="Territory" readonly="True" />
                                                <ASP:BOUNDCOLUMN headertext="Host" readonly="True" datafield="Host" sortexpression="Host" />
                                                <ASP:BOUNDCOLUMN headertext="Speaker" readonly="True" datafield="Speaker" sortexpression="Speaker" />
                                                <ASP:BOUNDCOLUMN headertext="Estimated Cost" readonly="True" datafield="Budget" DataFormatString="{0:C}"
                                                      ItemStyle-HorizontalAlign="Right" sortexpression="Budget" />
                                                <ASP:BOUNDCOLUMN headertext="Percent" readonly="True" datafield="Percent" sortexpression="Percent"
                                                      ItemStyle-HorizontalAlign="Right" DataFormatString="{0}%" />
                                                <ASP:BOUNDCOLUMN headertext="Status" datafield="Status" sortexpression="Status" readonly="True" />
                                                <asp:TemplateColumn>
                                                      <ItemTemplate>
                                                            <asp:TextBox id="textbox1" runat="server" TextMode="MultiLine"></asp:TextBox>
                                                      </ItemTemplate>
                                                </asp:TemplateColumn>
                                          </COLUMNS>
                                    </ASP:DATAGRID>
                              </ASP:TABLECELL>
                        </ASP:TABLEROW>
                        <ASP:TABLEROW>
                              <ASP:TABLECELL horizontalalign="Center">
                                    <ASP:BUTTON id="btnApproval" runat="server" text="Submit" OnClick="btnApproval_Click"></ASP:BUTTON>
                              </ASP:TABLECELL>
                        </ASP:TABLEROW>
                  </ASP:TABLE>

The problem is that the grid is too wide and I want the comments text box to appear on a separate line (in other words, to wrap).  I've tried adjusting the width of the table, and using the itemstyle-wrap property so the grid will only be as wide as the screen, but neither is working.  I can't figure how how to get the Comments textbox to appear on a separate line for each record in the datagrid.  Please let me know what I'm missing!