Why this icon can't clicked?and i add a event on it

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It looks to me like there is a widget in front of “this icon” and that is blocking any interactions with “this icon.” Even though part of the widget in front (with the angled border) is transparent (allowing “this icon” to be visible) the dimensions of all widgets are rectangular, so its dimensions would overlap–and thus block–“this icon” behind it.

One possible quick fix would be to add a hotspot widget in front and use that for your OnClick action (or use the Fire Event action to call the OnClick for “this icon”.