$WW,1$To create a TempleOS graphic ctrl, you define callback functions and insert a $LK,"CCtrl",A="MN:CCtrl"$ structure in the $LK,"CTask",A="MN:CTask"$ queue.  See $LK,"::/Demo/Graphics/SliderCtrl.CPP"$, $LK,"::/Demo/Graphics/ScrollBars.CPP"$ and $LK,"TermButtonNew",A="FF:::/Adam/WallPaper.CPP,TermButtonNew"$.  There is a template-code ctrl generator, if you press $FG,2$<CTRL-SHIFT-L>$FG$.