Oracle Apex Dynamic actions in tabular form

[tsraditya]

I am developing an app that captures the every day resource utilization of a person in a team.

I completed every thing and stuck up at a point i.e

As shown in the above image I created a Tabular form for this where month is a drop down list and year is a text box, the days 1,2,3,....31 are text boxes to capture utilized time.

My requirement is to make the days greyed out and lock (not to allow the user to enter data) for the days which are not in that month.

ex: when Month : Feb then 29,30,31 : greyed out and locked
I have searched in many websites for the solution, But I couldn't get one.