Also the dialog allows change only to current user. In other cases after ok pressing It always generate unhandled exception:
System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
at Microsoft.Win32.TaskScheduler.V2Interop.ITaskFolder.RegisterTaskDefinition(String Path, ITaskDefinition pDefinition, Int32 flags, Object UserId, Object password, TaskLogonType LogonType, Object sddl)
at Microsoft.Win32.TaskScheduler.TaskFolder.RegisterTaskDefinition(String Path, TaskDefinition definition, TaskCreation createType, String UserId, String password, TaskLogonType LogonType, String sddl) in c:\spb.Common Components\TaskScheduler\TaskService\TaskFolder.cs:line 404
at Microsoft.Win32.TaskScheduler.TaskFolder.RegisterTaskDefinition(String Path, TaskDefinition definition) in c:\spb.Common Components\TaskScheduler\TaskService\TaskFolder.cs:line 369
at Microsoft.Win32.TaskScheduler.Task.RegisterChanges() in c:\spb.Common Components\TaskScheduler\TaskService\Task.cs:line 1230
at Microsoft.Win32.TaskScheduler.TaskEditDialog.okBtn_Click(Object sender, EventArgs e) in c:\spb.Common Components\TaskScheduler\TaskService\TaskEditor\TaskEditDialog.cs:line 280
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)