Office Fabric has the concept of a "non-modal" panel: https://developer.microsoft.com/en-us/fabric#/components/panel
A non-modal panel does not show an shaded overlay over the rest of the panel, and the buttons in the non-modal area will react to hover events, however they do not respond to clicks (in the sample either)
I'm not clear on the purpose of a non-modal panel if this is not the case.
Is there a way to respond to clicks in the area outside the non-modal?