Gets or sets the group index of the current radio button.
Only one radio button in a group can be checked at any time.
Namespace:
C1.C1PreviewAssembly: C1.C1Report.2 (in C1.C1Report.2.dll)
Syntax
Remarks
By default, all RenderInputRadioButton objects are placed in
a single group with the GroupIndex set to -1.