Potential Bug in elm.invoke?

[Gintaras]

It is a bug in that control. Invoke() just asks it to do something. When DPI-related anomalies happen, try to find/get the element with flag UIA. In this case there is no flag, but a bool parameter. Try

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elm.focused(true);

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This probably isn't the reason, but child windows cannot be activated and therefore c.Activate() activates w instead. You may want to c.Focus().