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On Macintosh, Ctrl-Click is the gesture used to invoke a popup menu. In Matisse, both Ctrl-Click *and* Command-Click will bring up the popup menu. Command-Click should be used for multiple selection (which seems to work via Shift, but that's quite non-intuitive for a mac user).
*** This issue has been marked as a duplicate of 60643 ***
Although "shift + Click" also gets multiple items selected, NetBeans also supports "ctrl + click" also for this task on other platforms. I believe, as described on the bug, the equivalent "command + click" should be adjusted to have multiple items selected rather than bringing the context menu for the item.