In order to get at the ReturnKeyType -
foreach (UIView subView in ((UISearchBar)TableView.TableHeaderView).Subviews)
{
var view = subView as IUITextInputTraits;
if (view != null)
{
view.KeyboardAppearance = UIKeyboardAppearance.Default;
view.ReturnKeyType = UIReturnKeyType.Done;
}
}
This work for my use case.