WPF TextBox Caret Disappearing

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The problem seems to be common (1, 2) with the scale transformation, which is being applied by the behavior you mentioned in comments.

mainElement.LayoutTransform = scaleTransform;

And from MSDN, there's no

effective solution for this issue.

So, if you want to support multi-resolution, I would recommend ViewBox; simple, and do the job.

CodeHunter