/// <summary>Adds a radiobutton to the dialog</summary>
public RadioButton AddRadioButton(int id, uint groupId, string text, int x, int y, int w, int h, bool ischecked, System.Windows.Forms.Keys hotkey, bool isDefault)
{
// First create the RadioButton
RadioButton c = new RadioButton(this);
// Now call the add control method
AddControl(c);
// Set the properties of the button now
c.ID = id;
c.ButtonGroup = groupId;
c.SetText(text);
c.SetLocation(x, y);
c.SetSize(w,h);
c.Hotkey = hotkey;
c.isDefault = isDefault;
c.IsChecked = ischecked;
return c;
}