It takes longer than expected, the event handling of views in B4I and B4J is strange.
For the background:
I have a transparent panel on the root panel on this panel are the cards, so that you can see the card even if you are out of the range of the custom view.
The transparent panel has no events, but it still covers the events of the 2 buttons below (previous and next).
The problem of "setMouseTransparent" is that the child views are also affected by this, a workaround would be "setPickOnBounds" but that had no effect.
The same by "UsetInteractionEnabled = false" the child views are also affected by this, this is the reason why i did this thread.