I never use FLTK, but I guess that is something essential.
You need to declare your control widgets in the class KisWidget, not in the constructor of the class.

in class KisWidget write

Fl_Slider* ReleaseButton;

in the constructor  Widget::Widget(void* parentXwindow) write

ReleaseButton = new Fl_Slider( 220,5,35,100,"Rel");

Then you could access the widget pointers in kis_gui.cpp  like that

static void port_event(

self->widget->ReleaseButton->value(value);

ReleasButton is a NTK widget, not your class KisWidget.

(Just pseudo code here, it isn't exact syntax)

Still, I never use FLTK, I just wonder if you didn't need a deconstructor to delete the widgets instances which have created with "new" ( Like you need to do in GTKmm)?
Did FLTK manage the memory? 

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Philippe "xaccrocheur" Coatmeur
http://bitbucket.org/xaccrocheur / https://github.com/xaccrocheur
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