How to recongnize if acitivites's already confirmed from gantt chart?

Hi,

I confirmed an activitys as follows:

1. Switch to Gantt Chart screen

2. Choose an activity

3. click confirm button to open confirm dialog

4. input 30% and click back button to go back Gantt chart screen

on the Gantt Chart I cannot recognize if this activity was already confirmed. How to see this?

Please help!

Long Nguyen,