> I'm writing an application where a touch screen will be used.
> It is difficult to click the fold-in/fold-out icons in the Fl_Tree , due to the size of these icons.

> Is it possible to make the icons bigger ? Do there exist a parameter/function for that ?

Yes.
You need to make your own icon images, and set them using:

void Fl_Tree::openicon(Fl_Image *val); 

and 

void Fl_Tree::closeicon(Fl_Image *val);



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