Yes, thanks.
The tree structure in the properties menu seems to be similar to the Display Tree - perhaps even the same at a certain depth.
But not exactly the same. Here I marked some entries in the Properties Tree which don't show up in the Display Tree on the left:
Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
NewWindow("test", Outline Box("main menu",Distribution(
Continuous Distribution(
Column( :height )
),
By( :sex )
)))