Sets a value indicating which control characters are shown permanently on the screen.
<void> TXTextControl.setPermanentControlChars(<PermanentControlChar> permanentControlChars, [<EmptyRequestCallback> callback], [<ErrorCallback> errorCallback])
||Specifies which control characters are shown permanently on the screen.|
|callback||Optional. Is called when the operation completed.|
||Optional. Is called when the operation failed with an error.|