Gets or sets a value determining the appearance of the System.Windows.Forms.RadioButton.
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If the RadioButton.Appearance value is set to Appearance.Normal, then the System.Windows.Forms.RadioButton control is drawn with a circular check box. If the value is set to Appearance.Button, then the System.Windows.Forms.RadioButton is drawn as a control that can be toggled to an up or down state. Either type can display text, an image, or both.