Drag and drop in a treeview

I just implemented a drag and drop in a treeview. Thist is what I did:

Code:

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Private Sub treDatabase_ItemDrag(...) Handles treDatabase.ItemDrag
    DoDragDrop(e.Item, DragDropEffects.Move)
End Sub

Private Sub treDatabase_DragEnter(...) Handles treDatabase.DragEnter
    e.Effect = DragDropEffects.Move
End Sub


Private Sub treDatabase_DragDrop(...) Handles treDatabase.DragDrop
    Dim pt As Point
    Dim destNode As TreeNode

    If e.Data.GetDataPresent("BOSS_IBS_Addin.DatabaseTreeNode", False) Then
        pt = CType(sender, TreeView).PointToClient(New Point(e.X, e.Y))
        destNode = CType(sender, TreeView).GetNodeAt(pt)

        udtDatabaseTreeNodeCut = CType(e.Data.GetData("BOSS_IBS_Addin.DatabaseTreeNode"), DatabaseTreeNode)

        blnNodeCutInsert(udtDatabaseTreeNodeCut, Me.treDatabase, objDatabases, destNode)
    End If
End Sub

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So far so good....
But now there is the following problem.
If I select a menu of my contextmenu the treDatabase_DragDrop is executed again.

Any ideas?