[mono-vb] System.NullReferenceException: Object reference not set to an instance of an object at System.Windows.Forms.TreeView.MouseMoveHandler when dragging a node in a treeview

[Easy_Rider9999]

I am always getting this error, when dragging a node in my treeview. I
reported this error to Novell, but they say, that they can't reproduce it. I
get this Error with Mono 2.4 (both windows and Ubuntu 8.04). Is anybody
there that can reproduce this error? You can get my application at
https://sourceforge.net/project/showfiles.php?group_id=257087&package_id=315752&release_id=675230

This is the Error message:

System.NullReferenceException: Object reference not set to an instance of an
obj
ect
  at System.Windows.Forms.TreeView.MouseMoveHandler (System.Object sender,
Syste
m.Windows.Forms.MouseEventArgs e) [0x0015a] in
C:\cygwin\tmp\monobuild\build\BUI
LD\mono-2.4\mcs\class\Managed.Windows.Forms\System.Windows.Forms\TreeView.cs:223
0
  at (wrapper delegate-invoke)
System.Windows.Forms.MouseEventHandler:invoke_voi
d__this___object_MouseEventArgs (object,System.Windows.Forms.MouseEventArgs)
  at System.Windows.Forms.Control.OnMouseMove
(System.Windows.Forms.MouseEventAr
gs e) [0x0001c] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\class\Manage
d.Windows.Forms\System.Windows.Forms\Control.cs:6382
  at System.Windows.Forms.Control.WmMouseMove (System.Windows.Forms.Message&
m)
[0x00064] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\class\Managed.Wind
ows.Forms\System.Windows.Forms\Control.cs:5783
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m)
[0x0
01d4] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\class\Managed.Windows.
Forms\System.Windows.Forms\Control.cs:5387
  at System.Windows.Forms.TreeView.WndProc (System.Windows.Forms.Message& m)
[0x
0006b] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\class\Managed.Windows
.Forms\System.Windows.Forms\TreeView.cs:1198
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage
(System.Windows.
Forms.Message& m) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\
class\Managed.Windows.Forms\System.Windows.Forms\Control.cs:234
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc
(System.Windows.Fo
rms.Message& m) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mcs\cl
ass\Managed.Windows.Forms\System.Windows.Forms\Control.cs:215
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr
wPa
ram, IntPtr lParam) [0x00085] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.4\mc
s\class\Managed.Windows.Forms\System.Windows.Forms\NativeWindow.cs:242
frmMain.tvMed_BeforeSelect Start
frmMain.Form_Activate Start

Regards 

Hans
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