diff -ur planner-0.13/src/planner-gantt-view.c /tmp/planner-0.13/src/planner-gantt-view.c
--- planner-0.13/src/planner-gantt-view.c	2005-02-19 00:09:49.000000000 +0100
+++ /tmp/planner-0.13/src/planner-gantt-view.c	2006-05-13 12:49:18.000000000 +0200
@@ -875,7 +875,7 @@
 {
 	GtkTreeView       *tv = GTK_TREE_VIEW (view->priv->tree);
 	GtkWidget         *gantt = view->priv->gantt;
-	gint               row_height;
+	gint               row_height, separator_height;
 	gint               header_height;
 	gint               height;
 	GList             *cols, *l;
@@ -886,7 +886,10 @@
 	cols = gtk_tree_view_get_columns (tv);
 	row_height = 0;
 	header_height = 0;
-
+	gtk_widget_style_get(GTK_WIDGET(tv),
+	                     "vertical-separator", &separator_height,
+	                     NULL);
+ 
 	for (l = cols; l; l = l->next) {
 		col = l->data;
 
@@ -899,6 +902,7 @@
 						    NULL,
 						    NULL,
 						    &height);
+		height += separator_height;
 		row_height = MAX (row_height, height);
 	}