[Mono-bugs] [Bug 81675][Nor] New - [WIN32] NullReferenceException closing menu of DropDownButton

[bugzilla-daemon at bugzilla.ximian.com]

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Changed by gert.driesen at pandora.be.

http://bugzilla.ximian.com/show_bug.cgi?id=81675

--- shadow/81675	2007-05-18 13:54:38.000000000 -0400
+++ shadow/81675.tmp.25653	2007-05-18 13:54:38.000000000 -0400
@@ -0,0 +1,62 @@
+Bug#: 81675
+Product: Mono: Class Libraries
+Version: 1.2
+OS: 
+OS Details: Windows XP SP2
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: Windows.Forms
+AssignedTo: toshok at ximian.com                            
+ReportedBy: gert.driesen at pandora.be               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: [WIN32] NullReferenceException closing menu of DropDownButton
+
+When closing a menu of a dropdown button, two NRE's are reported:
+
+System.NullReferenceException: Object reference not set to an instance of 
+an object
+  at System.Windows.Forms.MenuTracker.Deactivate () [0x00000] 
+  at System.Windows.Forms.MenuTracker.OnMouseDown 
+(System.Windows.Forms.MouseEventArgs args) [0x00000] 
+  at System.Windows.Forms.Form.WmButtonDown (System.Windows.Forms.Message& 
+m) [0x00000] 
+  at System.Windows.Forms.Form.WndProc (System.Windows.Forms.Message& m) 
+[0x00000] 
+  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage 
+(System.Windows.Forms.Message& m) [0x00000] 
+  at System.Windows.Forms.Control+ControlNativeWindow.WndProc 
+(System.Windows.Forms.Message& m) [0x00000] 
+  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, 
+IntPtr wParam, IntPtr lParam) [0x00000] 
+System.NullReferenceException: Object reference not set to an instance of 
+an object
+  at System.Windows.Forms.ToolBar.OnButtonDropDown 
+(System.Windows.Forms.ToolBarButtonClickEventArgs e) [0x00000] 
+  at System.Windows.Forms.ToolBar.ToolBar_MouseUp (System.Object sender, 
+System.Windows.Forms.MouseEventArgs me) [0x00000] 
+  at (wrapper delegate-invoke) 
+System.MulticastDelegate:invoke_void_object_MouseEventArgs 
+(object,System.Windows.Forms.MouseEventArgs)
+  at System.Windows.Forms.Control.OnMouseUp 
+(System.Windows.Forms.MouseEventArgs e) [0x00000] 
+  at System.Windows.Forms.Control.WmLButtonUp 
+(System.Windows.Forms.Message& m) [0x00000] 
+  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& 
+m) [0x00000] 
+  at System.Windows.Forms.ToolBar.WndProc (System.Windows.Forms.Message& 
+m) [0x00000] 
+  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage 
+(System.Windows.Forms.Message& m) [0x00000] 
+  at System.Windows.Forms.Control+ControlNativeWindow.WndProc 
+(System.Windows.Forms.Message& m) [0x00000] 
+  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, 
+IntPtr wParam, IntPtr lParam) [0x00000] 
+
+To reproduce:
+1. compile and run the attached code snippet on Windows.
+2. follow the on-screen instructions.