When hitting down arrow key (by mistake) on topo plot, we get this error message:
***************************************************************************
** Error: Line 1022: Reference to non-existent field 'TensorDisplay'.
**
** Call stack:
** >figure_3d.m>FigureKeyPressedCallback at 1022
** >bst_call.m at 28
** >figure_3d.m>@(h,ev)bst_call(@FigureKeyPressedCallback,h,ev) at 73
**
***************************************************************************