diff --git a/Source/NSPopUpButton.m b/Source/NSPopUpButton.m
index 683605a3e..0eced25fb 100644
--- a/Source/NSPopUpButton.m
+++ b/Source/NSPopUpButton.m
@@ -296,10 +296,14 @@ Class _nspopupbuttonCellClass = 0;
 { 
   NSMenuView *mr = [[cell menu] menuRepresentation];
   NSEvent    *e;
-
+  NSNotificationCenter	*nc = [NSNotificationCenter defaultCenter];
+  
   if ([self isEnabled] == NO)
     return;
 
+  [nc postNotificationName: NSPopUpButtonWillPopUpNotification
+      object: self];
+
   // Attach the popUp
   [cell attachPopUpWithFrame: bounds
 	inView: self];