how to display the data on custom pop up(Created one form view for this pop up)

Hi Friends,

i have created one button on Sales agreement component Over view page....

Business required... once we click on that button one pop up needs to be opened.In that pop up i need to set three attributes  which are coming from differen different context nodes...

i have created one form view with 3 model bol entities...  for the pop up..

i need to display 3 fields in pop up which are coming from the above CNs...

for triggering the pop up i have already written the code in the event handler but i am unable to set the data on pop up..

Can you tell me how to write the code in event handler to set the date on pop up...