Summary: The method -[NSPopUpButtonCell dismissPopUp] doesn't seem to work. If I pop up the menu and then call dismissPopUp, nothing happens, then menu is still there. Steps to Reproduce: 1. Uncompress, open, build, and run the attached sample Xcode project "DismissPopUp". 2. Click the popup button to show the menu. 3. Wait 10 seconds. Expected Results: The popup menu is dismissed. Actual Results: The popup menu remains displayed. Regression: This problem occurs on multiple machines, and also occurs in Mac OS X 10.4.11. Notes: Attached compressed sample Xcode project "DismissPopUp.zip".