Wndows Form and Focus

I have a simple windows form that has a few labels and masked text boxes.
All controls are set to visible = false except for the first label and masked textbox.

What I am trying to do is when I enter the data into the masked txtbox, the next label and masked textbox shows visible=true.

The problem I am having , when I hit tab to change focus, there are no other controls to switch to as they are visible=false.

I tried to change visible=truse on the next control on leave but that does not seem to work.

Any ideas?

Thnaks