1 CASE 1, original layer tree
7 "contentsOpaque": true,
15 "contentsOpaque": true,
17 "backgroundColor": "#0000FF"
20 "position": [130, 130],
30 CASE 2, change color of "inner" to red
36 "contentsOpaque": true,
44 "contentsOpaque": true,
46 "backgroundColor": "#0000FF"
49 "position": [130, 130],