Pop-up event reminders in Korganizer, when synchronizing with Google Calendar

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http://unix.stackexchange.com – I have "connected" my Google Calendar with Korganizer. I create an event within my Google account. I want pop-up reminders to show up when I go home, even though the events weren't create by KOrganizer but were synced. I don't know if I did something wrong, but the events created by Korganizer don't have pop-ups either. I did check toggle reminder on. Any ideas? (HowTos)