Hey,

So I can't run your program because I'm missing the data, but the first thing to try with things like this is calling $MW->update; after you change something. Sometimes that's all it takes.

Hays

Update: Why don't you try:

$ca->clear();
$setdisplay(whatever);
$ca->redraw();
$mw->update;
[download]

I don't know if that will work any better, but it does use Tk::Graph's methods, which you might need to do. Maybe you can't change the type while the graph is drawn...

Also, the below posts are right, you should post your complete code, or at least a working version, so we can help you better.