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Thanks for your comment. However, it will not solve my problem because I need the panel on top of the button, either by parent-child or z-index relation. In my case, that z-index/parent-child relation is needed for layout UI purpose but I still need to handle the touch events. I have this situation quite often and have not figured it out how to make it properly and easily. I suppose any controls should automatically forward its event to below controls (event below means z-index or child) as in many other platforms.

Hi Alex, Thanks. So does it mean that I have to sub-class the panel to add the event listener? I just think it would be better if the panel just stood there as a drawing object instead of a control just hide everything below it. Anyway, I'm thinking to not use the panel and try some drawing with visual element or canvas instead.

Yes I mean this. But you will not able to initiate button press in any case( Alexey.

I figured it out how to do it, properly I guess. Actually, for image controls which only serve as UI building, I should use VisualElement class instead of Panel. For example before I sub-class the ImagePanel (whose sole purpose to display an image) from Panel and it got problem as mentioned above. Instead I sub-class it from VisualElement and my problem is solved. Now I can still draw images and place them around, even on/overlap other controls, such as buttons, scroll panels, etc. by changing the z-order accordingly but they will not consume my precious events as before.

Thanks for sharing!