tab control is not displaying output

[ymadhuri@rediffmail.com]

Hello labview enthuciasts,

I want to use tab controlling to run four sub vi s in a main vi. But when i execute the vi, the controls are functioning but  the indicators are displaying output. But when the subvi is opened, the indicators on subvi 's front panel display output. Can anybody help me identify what is missing and why the indicators on main vi's front panel are not displaying output. 

In the attached program run the "Main" vi.