Yes this is possible.
Place a control or indicator next to the tab control and move it with the arrow keys on top of the tab control. It wil not be placed in the tab control but will float on top of it. You see the difference by a shadow on the left and bottomside of the control. This shadow disappears when running the vi.
BUT...... don't do it for what you want.
Why use a tabcontrol if it can be done by an enumerated type also !
greetings from the Netherlands