access parent page control from iframe page

See more:

C#

hello all
i have page name account.aspx that contain iframe to open onother page name
accpopup.aspx ,accpopup.aspx page contain treeindex ,i wont transfer data from accpopup.aspx page to account.aspx page after choose(double click) account name from treeindex

how can i reach to controls into account.aspx from accpopup.aspx page

i try this code into popup.aspx page after click on name frpm treeindex
Control c = TreeIndex.Parent.Parent.Parent
but its get only controls inside popup.aspx page

i hope that is clear
any help

thanks>>>>