HI,
I have a two radio buttons.
<apex:selectRadio value="{!option}">
<apex:selectOption itemValue="Value1" itemLabel="lable 1">
<apex:selectOption itemValue="Value2" itemLabel="lable 2">
<apex:selectRadio/> 


when ever i select lable 1 it has to display one pageblock section(pageblocksection1).

Thanks,
nick.
 

i have two public groups ,each group have one user. when ever i created a case from group1 user that shoud be give read access  to group2 users.. by using Apex sharing...thanks