The z-order position is used to manage the superposition effects of several controls: if two controls are overlaid (two images for instance), the control displayed in the foreground will be the control with the highest z-order.
Modifying the z-order position of a control from the window editor or from the page editor
Modifying the z-order position of a control from the retort editor
To modify the z-order position of a control by programming
Single z-order position
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All you have to do is configure your product as follows: