z-index property not working [Nativescript] - nativescript

I am trying to place a circle above a line . I am trying to do it with z-index property . first time when the page is loaded it works fine.
But when i move to another component and come back, the circle goes down the line.
I am attaching the link for the screenshot along with this:
When first loaded:
when we move from it and come back:

Native layouts work bit different than HTML. The z-index you set is valid only within it's parent element not across the page. You are setting z-index on a element inside ListView item so anything within that item will only respect the z-index.
Looking at your code, you don't seem to need z-index if you just move your ListView after circle declaration or circle & line could be part of your item template itself.

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I have read similar issues about this here. But none of the suggested solutions worked for me.
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resize the windows
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This looks like a bug in aos.js.

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Edit:
It looks like I got your question all in a wrong way.
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All. I am emboding the Online Store PSD design to HTML/CSS. Here is link.
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enter image description here

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I have a panel containing a form (elements such as labels and textboxes within a table) and 3 buttons (in an hbuttonbox) at the bottom-right. If I shorten the panel by dragging the bottom border upwards, the 3 buttons come with it, and lay on top of the other form components, causing messy graphics. I would like the panel to not resize smaller than the bottom edge of the last component within it. Due to employer restrictions, I am not able to show a screenshot of the GUI. I will try to make any clarifications that are asked.
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EDIT:
Other suggestions:
Perhaps the HButtonBox has pack type 'end' instead of 'start'?
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I ended up adding a Height Request to the container, just slightly longer than the part of the scrolled window. This now stops resizing to where the bottom buttons would overlap the components above it. The problem (before the fix) is shown below:

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