Can'r run BLT twice?

[Ron Adam]

Todd Krein wrote:
> I'm running PythonWin on XP. When I run my plotter program the first
> time, it works fine. The second time I run it, I get the following
> error. If I exit PythonWin, and restart, I can again run it once. Any
> ideas?
> 
> Error: 1
> TclError Exception in Tk callback
>   Function: <bound method PathEval.doOpenTrace of <__main__.PathEval
> instance at 0x0127AC60>> (type: <type 'instancemethod'>)
>   Args: ()
> Traceback (innermost last):
>   File "C:\Python24\lib\Pmw\Pmw_1_2\lib\PmwBase.py", line 1747, in
> __call__
>     None
>   File
> "C:\NBU\perforce\hardware\test\home_survey\data\home_007\raw_data\KitchenToDen\AMPLITUDE\PathEval.py",
> line 89, in doOpenTrace
>     self.doPlotTrace()                          # go plot the thing
>   File
> "C:\NBU\perforce\hardware\test\home_survey\data\home_007\raw_data\KitchenToDen\AMPLITUDE\PathEval.py",
> line 117, in doPlotTrace
>     self.graph = Pmw.Blt.Graph(tkRoot)                   # make a new
> graph area
>   File "C:\Python24\lib\Pmw\Pmw_1_2\lib\PmwBlt.py", line 260, in
> __init__
>     None
>   File "C:\Python24\lib\lib-tk\Tkinter.py", line 1861, in __init__
>     self.tk.call(
> TclError: invalid command name "::blt::graph"
> 

I had that problem also at one time, but I can't remember just what I 
did to solve it. :-(

It is fixable though.  I know that's not much help. I'll look at how I 
use it in my program and see if that rings any bells.

Ron Adam