diff --git a/minigui.d b/minigui.d
index 491d526..ab6cf07 100644
--- a/minigui.d
+++ b/minigui.d
@@ -3079,6 +3079,10 @@ class TabWidget : Widget {
 				recomputeChildLayout();
 			}
 		}
+
+		version(win32_widgets) {
+			InvalidateRect(parentWindow.hwnd, null, true);
+		}
 	}
 }