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Gets or sets whether the IOptionButton is checked.
For option buttons in the same group, a checked state indicates the currently selected option in that group.
bool IsChecked { get; set; }
Property IsChecked As Boolean
IOptionButton optionButton = worksheet.Controls.AddOptionButton(20, 20, 72, 18);
optionButton.IsChecked = true;
bool isChecked = optionButton.IsChecked;