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The issue is more of how to replicate the scrollbar positioning and functionality. It's like I need an external (to the datagrid) scrollbar that can actually scroll the datagrid as expected. Then I can just vbox the button on top of this external scrollbar.
I'm confused. You indicated you wanted to toggle the visibility of columns.
I've crudely implemented this by reading in the columns into the right-click menu, and when a column name is selected here, the visibility is toggled. It works, but it's not the most elegant solution.
Specifically, I'm trying to emulate the "datagrid" that Mozilla Thunderbird uses to display emails. Here is an image: