Runtime RadioButtons Are Not Exclusive

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WinForms

C#5.0

I'm playing around with creating controls at runtime, just for fun.

I used this to drop a usercontrol on a form. The user control has a Label, a RadioButton, and a TextBox. No biggie.

int ControlsOnPanel = 0;
Panel pnl = new Panel();
pnl.Left = 5;
pnl.Top = ControlsOnPage * 21;
pnl.BorderStyle = BorderStyle.None;
pnl.BackColor = Color.AliceBlue;
for (int i = 1; i <= numRadioButtons.Value; i++)
{
    ControlsOnPage += 1;
    ControlsOnPanel += 1;
    EditableRadioButton rb = new EditableRadioButton();
    rb.Margin = new Padding(7);
    rb.RadioButtonText = "Type text here";
    rb.RadioButtonLabel = ControlsOnPage.ToString() + ".";
    rb.Top = (ControlsOnPanel * 21);
    rb.Left = 0;
    rb.Parent = pnl;
    pnl.Controls.Add(rb);
    pnl.Height = rb.Top+21;
}
pnlTarget.Controls.Add(pnl);

and it adds the EditableRadioButtons to the Panel (pnl) just fine, then puts that panel inside another one.

But the RadioButtons don't act like RadioButtons. I can click all of them and they stay clicked.

What did I miss? Or is it because the RadioButton is inside a UserControl and therefore is already exclusive within that control, and dropping it on a Panel with others won't make a bit of difference? :(