MDT Wizard Editor - Creating custom pane & variable

[Strikers]

Hi,

I need some help to create a custom pane with custom variables. I'm trying since several days to figure out how it has to be done, but I keep on failing :-(

I have WDS & MDT (no SCCM)

What I need to accomplish:

Custom Pane with dropdown selection of Country & then depend of this a 2nd dropdown with cities belonging to this country.

Country and city should be already pre-selected by a variable which is set in cs.ini under GATEWAY. Default value can't be hardcoded as it does change sometimes and the user needs to be able to change the pre-selection.

I need both custom values (country & city) later on for correct computernaming and for the domain join OU path.

What I have so far:

I added a new

CustomPane (Location) with the MDT Wizard Editor and the following HTML code directly after the "Select Task Sequence" pane:

<H1>Specify the location you want to install the device for.</H1>

<table>

  <tr><td colspan=2>
    <H4></H4>
    </td></tr>

  <tr valign=top>

    <td width="80px">
      <img src="DeployWiz_Language.png">
    </td>

    <td width="100%">
      <p>Select country:</br>
    <SELECT NAME="CS_Country">
      <option value="DE">Germany</option>
      <option value="UK">United Kingdom</option>
      <option value="...">...</option>
    </SELECT>
  </p>

<p>Select site:</br>
<SELECT NAME="CS_Site">
  <option value="FR">Frankfurt</option>
  <option value="LO">London</option>
  <option value="...">...</option>
</SELECT>
</p>

</td>
</tr>

</table>

cs.ini

[Settings]
Priority=Make,Model,DefaultGateway,Default
Properties=MyCustomProperty,CS_Country,CS_Site

[Default]
;Serialnumber shorter then 8 digits should be filled with leading 0 and greater then 8 only used the last 8 digits
OSDComputerName=%CS_Country%-%CS_Site%-%SERIALNUMBER%
...

[DefaultGateway]
1.2.3.4=DEFR
5.6.7.8=UKLO
...

[DEFR]
DeployRoot=localserver
CS_Country=Germany
CS_City=Frankfurt

The custom variables don't work and I don't know how to make this dropdown dependency working. I assume I'm missing a VBS connected to this CustomPane to work correctly and to parse/retrieve the values from CS.ini ?

I would apreciate any help to get this somehow working correctly.

Thanks!