updating FXCanvas

When a user clicks a button a new window opens and several plots
are displayed on a FXCanvas. When the plot has up to about 30
curves everything works fine. When I make more than about 50 they
do not display when the new window first opens. I have to refresh
the window for the plot to display. I have a timer with a 0.5 s
delay to allow the plot to be drawn. I've increase this to 5 s
with no effect. I've also tried for force it with no effect:

 

_canvas->update();

_canvas->forceRefresh();

 

I only see this problem on Windows, on the Mac and Linux it does
not matter how many curves are displayed, they show up when the
window first appears.

 

Any ideas?

 

Kind regards,

 

js

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