[Dip @phil Thompson] A small popover is displayed first If you RadioButtons, how to fix it?

[孤木成林]

Code :


```
from dip.model import Enum, Model, Str, Int, unadapted
from dip.ui import Application, Dialog, SpinBox, HBox, DialogController, RadioButtons, CheckBox, ComboBox


class DataModel(Model):
    name = Str("")
    w = Int(100)
    h = Int(100)
    test = Enum("1", "2", "3")


model = DataModel()


# Every application needs an Application.
app = Application()


view_factory = Dialog(


    RadioButtons('test',),
    # ComboBox('test', vertical = False),
    HBox('name',
         SpinBox('w', suffix = " years"),
         SpinBox('h', suffix = " years"),
         ),
    window_title = "Dialog with Settings")


view = view_factory(model)
view.execute()
print("Name:", model.name)



```
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