need abit help on html checkbox and combobox

Hey guys, im new here :wave: and need your help, Im tryn to make a program to auto login, submit and assign stuff, so im kind of a stuck here.

there is 3 combobox, and after setting the first one to value 2, the second combo box does not load, when using mouse it does

This is how i did

webpageelement.GetAttribute("name") = "region" Then
WebBrowser1.Document.GetElementById("region").SetAttribute("selectedIndex", 2)

This is how that HTML page is

<select name="region" onchange="GameInfo.loadServerList(this.value, $(':select[name=server]', this.form))">
<option>== Choose your region ==</option>
<option value='1'>Value 1</option>
<option value='2'>Value 2</option>
<option value='3'>Value 3</option>

</select>

There seems to be a bit of an epidemic of misplaced threads lately. The CodeBank forums are for sharing working code examples, not for asking questions. This question belongs in the ASP.NET forum, so I have asked the mods to move it there for you.

oh, sorry for that, im new so didnt know, and thank you