Sets the character which is used to display the checkbox in the unchecked state.
<void> CheckFormField.setUncheckedCharacter(<String> character, [<EmptyRequestCallback> callback], [<ErrorCallback> errorCallback])
|character||The character which is used to display the checkbox in the unchecked state.|
|callback||Optional. Is called when the operation completed.|
||Optional. Is called when the operation failed with an error.|