Oracle Forms

I have an item type number. When it was on default justification which is start, I can see a blinking cursor when I click on that item and so I know that the fucos is on that item. Now, I changed the justification into center, I can't see that blinking cursor anymore. Even if I type some numbers and use the arrows on keyboard, there's no blinking cursor on that item. I want to display it so that the user can see where the current focus on that form.