RhinoGet.GetMultipleObjects doesn't trigger DataGridView update

Continuing the discussion from WindowsForms vs Eto.Forms:

Can any C# winforms guru shed some light on this? I have a button and it triggers a RhinoGet.GetMultipleObjects call. Afterwards a DataGridView is supposed to show the meta data of selected rhino objects. The problem is that the datagridview doesn’t refresh post-call, until I interact with another winforms UI element that access that datagridview.

oh the joy of debugging…
see my own answer to my own silliness: