Widget Refresh on Tab Change

I am using the MicroflowLabel/Context widget, and I would like it to recalculate every time I switch to the tab in which it's located. I see that there is a refresh interval but I would like it only to refresh when the specific tab is switched to. I tried turning on the 'Refresh on show' option for the tab, but it doesn't do the trick. Is there any way to accomplish this?
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