There's something funny about this page, although I can't tell what.
I pasted your code in a new page, switch to Design View and converted the column. Nothing happened. Then I switch to the Edit Columns dialog again and converted the CreateDateTime column. This time, both columns were converted.
Anyway, it seems like a bug in VWD to me. You can report it to Microsoft if you want. If you want to continue with the book, here's the code for the column:
Code:
<asp:TemplateField HeaderText="Authorized" SortExpression="Authorized">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Authorized") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Authorized") %>' Enabled="false" />
</ItemTemplate>
</asp:TemplateField>
Cheers,
Imar