diff --git a/table.go b/table.go
index 7e1ad4f..7fc5322 100644
--- a/table.go
+++ b/table.go
@@ -200,6 +200,7 @@ func (me *TreeInfo) makeTable(t *guipb.Table) {
 		return
 	}
 	me.Add(grid)
+	grid.State.ProgName = "TableGridPB"
 	// log.Info("tree: makeTable() finished add win & grid")
 	var h int = 0
 	var w int = 0
@@ -313,7 +314,10 @@ func (n *Node) InTable() bool {
 	grid := FindWidgetById(int(n.ParentId))
 	if grid != nil {
 		if grid.WidgetType == widget.Grid {
-			return true
+			if grid.State.ProgName == "TableGridPB" {
+				// this is a protobuf table
+				return true
+			}
 		}
 	}