diff --git a/windowZooPB.go b/windowZooPB.go
index f74e95e..d4e835a 100644
--- a/windowZooPB.go
+++ b/windowZooPB.go
@@ -38,6 +38,10 @@ func addButtonForZooPB(grid *gui.Node) (*gui.Node, *gadgets.GenericWindow) {
 
 			// display the protobuf
 			t = AddMachinesPB(tbox, me.machines)
+			f := func(id int) {
+				log.Info("got to MachinesTable.Custom() id =", id)
+			}
+			t.Custom(f)
 			log.Info("table has uuid", t.GetUuid())
 		})