diff -ru planner-0.14.4.orig/src/planner-gantt-view.c planner-0.14.4/src/planner-gantt-view.c
--- planner-0.14.4.orig/src/planner-gantt-view.c	2008-08-02 21:00:12.000000000 +0100
+++ planner-0.14.4/src/planner-gantt-view.c	2009-12-11 10:21:01.000000000 +0000
@@ -201,19 +201,23 @@
 static gboolean
 gantt_view_chart_scroll_event (GtkWidget * gki, GdkEventScroll * event, PlannerGanttView *view)
 {
+	gboolean dontpropogate = FALSE;
+
 	gboolean can_in, can_out;
 	PlannerGanttViewPriv *priv;
-	
+
 	if (event->state & GDK_CONTROL_MASK) {
 		priv = view->priv;
 		planner_gantt_chart_can_zoom (PLANNER_GANTT_CHART (priv->gantt), &can_in, &can_out);
 		switch (event->direction) {
       			case GDK_SCROLL_UP: {
+      				dontpropogate = TRUE;
 				if (can_in)
 					gantt_view_zoom_in_cb  (NULL, view);
 	        		break;
 			}
 			case GDK_SCROLL_DOWN:
+      				dontpropogate = TRUE;
 				if (can_out)
 					gantt_view_zoom_out_cb  (NULL, view);
 			        break;
@@ -222,7 +226,7 @@
 		}
     	}
 
-	return TRUE;
+	return dontpropogate;
 }
 
 static void
diff -ru planner-0.14.4.orig/src/planner-usage-view.c planner-0.14.4/src/planner-usage-view.c
--- planner-0.14.4.orig/src/planner-usage-view.c	2008-08-02 20:56:19.000000000 +0100
+++ planner-0.14.4/src/planner-usage-view.c	2009-12-11 10:22:01.000000000 +0000
@@ -122,6 +122,8 @@
 static gboolean
 usage_view_chart_scroll_event (GtkWidget * gki, GdkEventScroll * event, PlannerView *view)
 {
+	gboolean dontpropogate = FALSE;
+
 	gboolean can_in, can_out;
 	PlannerUsageViewPriv *priv;
 	
@@ -130,11 +132,13 @@
 		planner_usage_chart_can_zoom (priv->chart, &can_in, &can_out);
 		switch (event->direction) {
       			case GDK_SCROLL_UP: {
+				dontpropogate = TRUE;
 				if (can_in)
 					usage_view_zoom_in_cb  (NULL, view);
 	        		break;
 			}
 			case GDK_SCROLL_DOWN:
+				dontpropogate = TRUE;
 				if (can_out)
 					usage_view_zoom_out_cb  (NULL, view);
 			        break;
@@ -143,7 +147,7 @@
 		}
     	}
 
-	return TRUE;
+	return dontpropogate;
 }