AJAX :: TabPanel Content Are Always Visibility:hidden, Display: None On All But First Tab

I am trying to use the TabContainer/TabPanel controls to create 3 tabs. The tabs themselves will always appear, however, only the first tab will ever display. When I look at the source of the page, I find that the 2nd and 3rd panels have style="visibility:hidden;display:none" on them. The only time this is not true, is if the content inside the tables is text that is on the source, nothing generated.

I have tried it using controls, repeaters, adding all my tabs dynamically, setting the properties of visibility=True and enabled=true. I am kind of pulling my hair out here.

ASPX coding:

<asp:TabContainer ID="aeDetails" runat="server">
<asp:TabPanel ID="placeholder" runat ="server" HeaderText ="PlaceHolder" ><ContentTemplate >Place Holder</ContentTemplate></asp:TabPanel>
</asp:TabContainer>
VB.NET Code:
' Get the content for the home page.
getHomePageContent()
' get the announcements, if any
getAnnouncements()
' get the events, if any
getEvents()
' remove placeholder after adding all three tabs
For i As Integer = 0 To aeDetails.Tabs.Count - 1
If aeDetails.Tabs(i).HeaderText = "PlaceHolder" Then
aeDetails.Tabs.RemoveAt(i)
Exit For
End If
Next

I will only put the code for one tab in here as they are all pretty much the same.

Private Sub getAnnouncements()

Dim nt As TabPanel = New TabPanel()
nt.HeaderText = "Viscardi Announcements"
nt.ID = "tpAnnouncements"
nt.Visible = True
nt.Enabled = True
Dim nl As Label = New Label()
Dim sb As StringBuilder = New StringBuilder()
Dim anRec As HVS_Announcements_Record = New HVS_Announcements_Record
Dim anList As List(Of HVS_Announcements_Record) = getCurrentAnnouncments()
Select Case anList.Count < 1
Case True
nl.Text = "There are currently no announcments for the Henry Viscardi School"
nt.Controls.Add(nl)
aeDetails.Tabs.Add(nt)
Return
End Select
sb.Append("<ul>")
For Each anRec In anList
sb.Append("<li><a onclick='MM_openBrWindow")
sb.Append("('announcementDetails.aspx?id=" & anRec.HVS_AR_Id & "','newWindow','status=yes,scrollbars=yes,resizable=yes,width=600,height=500'")
sb.Append("target='_blank' title='Click to view full contents of the announcements'>")
sb.Append(anRec.HVS_AR_AnnouncementTitle & "</a></li>")
Next
sb.Append("</ul>")
nl.Text = sb.ToString()
nt.Controls.Add(nl)
aeDetails.Tabs.Add(nt)
End Sub

All of the content that is generated by the various routines is in the page source, just hidden.