Wasn't able to back out of purchase RP menu

I'm using the new alpha client and was browsing the store while I was waiting for queue and accidentally clicked on purchase RP at the same time as a match was found. NBD right? Nah, Was unable to exit the menu in order to accept the match. Missed the match. Then I found I was unable to find an option to exit out of the purchase RP menu. I was forced to Alt + f4 the client in order to exit. Not a big deal just something to take note of.