Reflection, TabPages and ListViews

[Sarmatia]

I'm stumped.

I load add-ins at run time. Each Add-In has a collection of
UserControls. These UserControls are then added to a TabControl as
TabPages. The UserControls are created in the Add-In's ctor.

Here's the code that loads the Tab Control when the add-in is selected
from a List;

private void LoadTabPages(string AddInName)
{
tabControl1.TabPages.Clear();

//addIns is a Dictionary<string, IAddIn>
IAddIn addIn = addIns[AddInName];
if(addIn == null)
return;

foreach (UserControl ctr in parser.TabForms)
{
TabPage t = new TabPage(addIn.Tag.ToString());
ctr.Dock = DockStyle.Fill;

tabControl1.TabPages.Add(t);
t.Controls.Add(addIn);
}
}
It works fine, except that I cannot get the Add-In to update its own
listview after it's already been selected from the List.

Example of when it works
1. Start App
2. Run process that adds to the Add-In's ListView
3. Select that Add-In from a list
4. The Addin's UserControl (with ListView) is added to a TabControl as
a TabPage
5. All the data is present in the ListView

Example of when it does not
1. Start App
2. Select that Add-In from a list
3. The Addin's UserControl (with ListView) is added to a TabControl as
a TabPage
4. Run process that adds to the Add-In's ListView
5. No Data is shown in the ListView

But the stickler is, when I step through the code, the ListView clearly
shows Items present, they are just not being displayed. >:|

I've tried using
PerformLayout();
ResumeLayout();
Invalidate();
Refresh();
etc, but nothing works.

Please Help.
I'll gladly post more code if needed.