The transparent objects need to be drawn after the other objects if you want to be able to see the other objects through them.
You can control the order of the drawing by changing the objects' ranks in the tree view. Objects at the top of the tree will be drawn last.
Move your transparent objects to the top of the tree.
The reason is much simpler than your guesses.
When traversing the tree, it draws the parent object before the subnodes of that object.
So you can't see the flowitems in the cabin because it draws the cabin before the flowitems.
This default ordering is very useful when the flowitems have transparency, but it is backwards from what you want when the main object has transparency.
To fix it, add a surrogate component to your object to draw the shape and set the main object's shape to an invalid path, such as ***. The surrogate objects will be drawn after the contents so you will be able to see the items through the surrogate object's shape.
Attached is an example. shape-draw-order.fsm
This question also addresses this same issue, but with custom draw code instead of simply the main object shape.
Use the surrogate object to draw the shape and set the object shape index of the surrogate object.
You are still drawing the shape with the parent object.
You can use first(drawsurrogate(object)) to get a reference to the surrogate object.
Here's your model with these changes: 18158-transparent-cabin2-1.fsm
By the way, you should have posted a sample model with your original question 8 days ago, and then you could have had this solved 8 days ago instead of only now posting enough information to understand what you are doing.
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