My reminders for Thunderbird's Lightning calendar add on pop up behind the current window I am focused on (such as a web browser). This makes it very difficult to notice a reminder is happening, especially if my headphones are off so I cant hear its "beep". Ive nearly missed 2 meetings due to this recently, and only noticed because my panel indicator changed colors, then I noticed in my unity launcher that Thunderbird had a second window open, so I had to cycle through its windows to get the reminder to pop up. That being said, everything else is working fine with Lightning/reminders - just that the reminder window appears 'hidden' behind a pile of other open application windows.
I am now using Ubuntu 14.04 LTS, though I had this working as expected when I was using 13.04 and 13.10 (I had to fresh install, instead of upgrade, because as usual, Ubiquity installer crashed during the install, destroying my prior system). I post this here, because I recall I had to mess with one of the random obfuscated settings in compiz, dconf, some-tweak-or-another tool, and cant seem to find it now.
I was searching on duckduckgo/google all morning for this, and I could have sworn this was trivial for me to search and find the last time I solved this.
How can I force a Lightning/Thunderbird reminder to always be the topmost window, regardless of the application in which I am focused?