Application Express :: Hiding / Displaying Regions Using Radio Button Not Working?

APEX 4.1 / 11g
Theme 21

I have a page with about 8 Classic reports. 4 of them percentage values, 4 totals. I have one RG with a Percentage or total option. When I select the percentage radio, it should hide all the total regions. When I select the totals radio it should hide all the percentage regions. Simple? So I thought. This is what I did.

1. Created a RG(P2_RG) -> Page value is redirect and set value.

2. STATIC:Percentage;P,Total;T

In the RG, I have created a normal DA which has the true and false events as follows.

Event -> Change
Items -> P2_RG
equal to -> P

In the true actions, I have hidden the 4 totals regions.
shown the 4 Percent regions.
In the false action, I have shown
hidden the 4 percent region
shown the 4 totals region.

The event specification for one these true actions is

Action -> Hide (If I am hiding)
Fire when event is ->True
Selection type -> region
Region -> The region I want to hide/show.

But it does not work! I tried to replicate the issue on apex, by using a small example but could not. Works fine in apex following the same process.

[URL]

I tried to debug by having a display item to show the value when I change the radio button. The values are changing properly. I tried actually, adding a condition filter in the region itself by using the "Value of item/column in expression1 = expression 2" where expression one I tried :P2_RG and expression 2 as P but that just hides the whole region.