RadioButton Grouping in Windows Form

Everyone says that just put a container object (Panel, Groupbox and etc) and inside it the RadioButton controls that the container groups. However, there is no way to work with the ItemIndex property, for example, because the Groupbox does not have this prop. There is a way to group Radiobutton controls, but in order to work with them, as being a single grouping and not having them in a single location and doing everything individually, control the control. How is it?