Cursor is different after set by gtk

[Beast <beast i6x org>]

   $self->{busycur} = Gtk2::Gdk::Cursor->new('GDK_WATCH');
   $self->{normcur} = Gtk2::Gdk::Cursor->new('GDK_LEFT_PTR');
   $self->{rootwin} = Gtk2::Gdk->get_default_root_window();

   $self->{rootwin}->set_cursor($self->{busycur});
   $self->redraw();
   ## Do some task
   ...
   $self->{rootwin}->set_cursor($self->{normcur});
   ...
===

After setting cursor with GDK_LEFT_PTR, the cursor is different than 
previous cursor. It turn into black left_pointer which should be white 
left_pointer. What could be the problem?


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--beast