How do I click a form button with webbrowser control?

I'm trying to automate a web form.

The button that submits the form's ID is "buttonID".

I know that my submit variable is matching the element because i've successfully performed submit.innerText

I need to be able to click on this button... how is it done?

Code:

---

Dim submit As HtmlElement = wb.Document.GetElementById("buttonID")
submit.InvokeMember("click")

---

maybe try:

vb Code:

wb.Document.GetElementById("buttonID").InvokeMember("click")

are there any frames on the page? or more than one form?