Overlapping widgets in vertical box

How can I completely overlap other widget being placed in a vertical box?

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What I want to achieve is something like this.

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Icon widget has this hierarchy, where “Image” is the dark color background and “Icon” is the texture set dynamically.

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They are added to the vertical box “UnitList“.

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Thanks.

Replace it with canvas panel and problem solved.

With a little bit of tweaking done.