Progress slide button doesn't grayedout while revisit slide.

Hi, I have same issue but it's quite different. I have used slides as Progress button.

Progress button1= Slide1

Progress button2= Slide2

Progress button3= Slide3

Progress button4= Slide4

Progress button5= Slide5

User will go in sequence 1st then 2nd, 3rd, 4th & 5th.

I have used manually buttons for all 5 slides.

slide1(Progress button):- button1(Active with Grayedout), button2(blank), button3(blank), button4(blank), button5(blank) http://screencast.com/t/TGojL2RL

slide2(Progress button):- button1(Grayedout), button2(Active with Grayedout), button3(blank), button4(blank), button5(blank)

slide3(Progress button):- button1(Grayedout), button2(Grayedout), button3(Active with Grayedout), button4(blank), button5(blank) http://screencast.com/t/VE5YYTTAKjqn

slide4(Progress button):- button1(Grayedout), button2(Grayedout), button3(Grayedout), button4(Active with Grayedout), button5(blank)

slide5(Progress button):- button1(Grayedout), button2(Grayedout), button3(Grayedout), button4(Grayedout), button5(Active with Grayedout)

If we go 1 to 5th slide then all working fine but if user go on 5th to any slide like 5th to 1st then 2nd, 3rd, 4th & 5th slide progress button looks with blank instead of Grayed out. http://screencast.com/t/TGojL2RL

Please hint me how I complete slides with above functionality.