_acceptNonPrintableKeysInFormulaMode() {
        return this.eventKey === AutoNumericEnum.keyName.Backspace || this.eventKey === AutoNumericEnum.keyName.Delete ||
            this.eventKey === AutoNumericEnum.keyName.LeftArrow || this.eventKey === AutoNumericEnum.keyName.RightArrow ||
            this.eventKey === AutoNumericEnum.keyName.Home || this.eventKey === AutoNumericEnum.keyName.End;
    }
Returns `true` if the non-printable key is accepted in formula mode

@returns {boolean}
@private