[vtkusers] vtkInt.tcl|toplevel .vtkInteract -bg #bbbbbb|invalid command name "toplevel"

[Tux Pinguin]

Hi ,
I tried to run one of the tcl examples, but  I get the following message

tux at aas:~/tclvtkgraphics$ tclsh Cone.tcl
invalid command name "toplevel"
    while executing
"toplevel .vtkInteract -bg #bbbbbb"
    (procedure "vtkInteract" line 27)
    invoked from within
"vtkInteract
"
    (file "/usr/share/doc/vtk/examples/examplesTcl/vtkInt.tcl" line 99)
    invoked from within
"source $VTK_TCL/vtkInt.tcl"
    (file "Cone.tcl" line 6)
tux at aas:~/tclvtkgrafik$

any suggestions ?

thanks

guido