It all depends on your relations with superiors. Normally, if you are in employment and wanted to attend classes, you have to obtain written permission for such study assuring them that your work will not be neglected and that you can not state the reason for stoppage of a routine transfer for such education. Infact, the more qualified the employee, the more convenient for the employer.
First, stop worrying as you have not resorted to criminal offense and in no way neglected your job and concealed any disqualification for getting such employment.
Do not neglect your job and maintain good working relations so that they may encourage you for your career growth.
Depending on such employment notification, you may have to obtain prior permission for applying through proper channel and should not conceal present employment while applying for other jobs.