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Weird behavior of focus

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Simple ...

Does anyone had a similar problem with vb6....

When i open .exe application originally made with VB6, load some dll made with .NET under certain circumstances ( unknown ) form lose focus and no way i can get it back. i.e i click manually on textbox and trying to switch with tab or enter but nothing is happening.

The only way to get focus back is to reload the complete exe and it works without problem.

What may cause tab order / focus to stop working until restart. I run code and do the same steps like 10 times and error occur only once. How to debug those behavior ?

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