Switching tabs should immediately set focus on the new tab

[ltfish]

Description

Currently, switching to a new tab does not make the controls on the old tab lose focus. As a result, you can select an instruction in the disassembly view, switch to the strings view, and then press X to invoke the xrefs dialog for the instruction in the disassembly view. The correct behavior should be automatically set focus on the container in the new tab after switching to it.

I plan to fix it after @mborgerson merges in the fancy tabs.

Steps to reproduce the bug

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Environment

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Additional context

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