Issue Description

I want to use
window.showModalDialog to open a pop up window and then select a value
in the Pop up window and return it back to Opener window. My pop
up window is an .aspx page that contains a radio button list (a list of
citys). When I select one city, it should bring it back to the opener
window.Actually, what is happening now is that, when I click on
particular city,a new blank window appears which is undesirable.
Note: the RadioButtonList has autopostback property set to true.

Solution

Maybe you have known that Iframe or frame is the solution, there is a sample : http://www.zzgyxx.com/bbs/dispbbs.asp?boardID=21&ID=916.but I don’t want to use it because it’s very awkward.
There
is other way can do it , just add the code <base target=”_self”>
on the modal web page between <head> and </head>.Very
effectually!