What are the source settings of your radio button?
What are the LOV values?
Do your dynamic actions (for dynamic region changes) submit the value of the radio button to session state?
What version of APEX are you using?
I am using 4.0 version of apex
LOV values are static values only..
In source settings I have selected "only when current value in session state is null'.
I created a page with "page action when value changed" as submit, and the radio rendered as expected.
You still haven't informed what your radio does on click. Without an example or more detailed information, it's hard to debug.
I have three regions. In one region I've created radio buttons.Based on selection of the radio buttons,the respective regions should display.
So I wrote dynamic actions for the radio buttons.
In both the regions, I have submit buttons. The dynamic actions are working properly when I select the radio buttons. But, When I submit the page from one region, after the page refresh it is not staying in the page that I have submitted earlier. The radio button selection is getting changed.
Hope you understood this time.
Waiting for your reply
I think an example on apex.oracle.com would be required.