Organic Group Events showing everywhere

Hello,

I have the following problem:

I want a block with all the events in 1 particular group.
When I use the
block "Group Calendar", nothing is showed. When I
use the block "List of
upcoming events", all the events, even from other
groups, are shown

How can I make a block that shows only the events of one
particular group ?

Kind regards,

Steven Vermoere
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