Custom Control - Design Time Support

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I am creating a custom control which is a form generator. Basically you
define some parameters, and it will build input control (textbox), tooltip,
validation code etc in one swoop.

Something such as:
1 <tt:DataForm ID="DataForm1" runat="server">
2 <Columns>
3 <tt:DataColumn ID="FirstName" runat="server"
AllowDottedDecimal="False" AllowDottedHex="False"
4 AllowDottedOctal="False" AllowHybrid="False"
AllowIPv6="False" AllowTerritories="False"
5 Exponent="False" Format="" Fractional="False"
InvalidMessage="" Label="First Name" Lowercase="False"
6 MissingMessage="" RegExp="" Required="True" Scheme="False"
Signed="False" Trim="False"
7 UCFirst="False" Uppercase="False"
ValidationType="ValidationTextbox" Value="">
8 </tt:DataColumn>
9 <tt:DataColumn ID="LastName" runat="server"
AllowDottedDecimal="False" AllowDottedHex="False"
10 AllowDottedOctal="False" AllowHybrid="False"
AllowIPv6="False" AllowTerritories="False"
11 Exponent="False" Format="" Fractional="False"
InvalidMessage="" Label="Last Name" Lowercase="False"
12 MissingMessage="" RegExp="" Required="True" Scheme="False"
Signed="False" Trim="False"
13 UCFirst="False" Uppercase="False"
ValidationType="ValidationTextbox" Value="">
14 </tt:DataColumn>
15 </Columns>
16 </tt:DataForm>

So lets pretend your form has 30 columns. It will create 30 textbox's based
on the parameters you set etc.

I am new to ASP.NET so please bare with me. I have all this working
currently. My main issue is, if a developer is using my form generator, how
do they access those inputs in the postback?

Sure they can do dataForm.FindControl("something"); 30 times and then if
textbox, if combobox, build SQL for insert/update etc. But this seems very
ugly to me.

How can I make the TextBox's that my control generates based on the
parameters visible to the designer so someone can do something such as:
Text1.Text in the postback codebehind?

I am positive designer interface of some sort can help here but I am not
very experienced. I have only done some basic designer stuff like
CollectionEditor's etc.

Any help would be greatly appreciated.

Thanks and take care.