How to validate textfields if data is modifier

Dear All

I got a small issue regarding a textfield & a combobox. First of all i filled some data in 2 texfields and selected one value in combobox and i have to click one button for validating and then i have to click 'Create' button for the creation of new material, now the problem before trying to click 'Create' button if i had changed the values in those 2 textfields and combobox it should prompt me to click that validating button.

I think u got my point, how to resolve this issue. By using any events. KeyPressed event is used for validating the length and for numeric/charcaters, the same thing can be implemented in this method? can u guide me in this thing.

Waiting for your reply.

Crosspost!: Java Programming - How to validate textfields if data is modified before clicking button