I'm not sure if this is a bug, or intentional, but this is the case:

When you use menu events for a custom window, and also add popup items to it, the rclick event wont trigger, the rest will.

menu @test {
  sclick:echo -s sclick in @test!
  rclick:echo -s rclick in @test!

  ; If you disable the following, above will work fine
  Popup:echo -s clicked on popup in @test!

This bug can be rather anoying in some situations. frown