Fixed OnModelChanged for Metro version
Fixed OnModelChanged for Metro version

Rustemt/oxyplot,as-zhuravlev/oxyplot_wpf_fork,Kaplas80/oxyplot,lynxkor/oxyplot,H2ONaCl/oxyplot,bbqchickenrobot/oxyplot,br111an/oxyplot,shoelzer/oxyplot,Sbosanquet/oxyplot,sevoku/oxyplot,GeertvanHorrik/oxyplot,Mitch-Connor/oxyplot,svendu/oxyplot,sevoku/oxyplot,objorke/oxyplot,Mitch-Connor/oxyplot,HermanEldering/oxyplot,Kaplas80/oxyplot,Sbosanquet/oxyplot,jeremyiverson/oxyplot,BRER-TECH/oxyplot,shoelzer/oxyplot,ze-pequeno/oxyplot,Sbosanquet/oxyplot,br111an/oxyplot,H2ONaCl/oxyplot,mattleibow/oxyplot,bbqchickenrobot/oxyplot,as-zhuravlev/oxyplot_wpf_fork,jeremyiverson/oxyplot,shoelzer/oxyplot,oxyplot/oxyplot,zur003/oxyplot,Rustemt/oxyplot,freudenthal/oxyplot,svendu/oxyplot,NilesDavis/oxyplot,BRER-TECH/oxyplot,svendu/oxyplot,jeremyiverson/oxyplot,DotNetDoctor/oxyplot,objorke/oxyplot,HermanEldering/oxyplot,Jofta/oxyplot,H2ONaCl/oxyplot,Mitch-Connor/oxyplot,DotNetDoctor/oxyplot,GeertvanHorrik/oxyplot,Isolocis/oxyplot,objorke/oxyplot,lynxkor/oxyplot,freudenthal/oxyplot,as-zhuravlev/oxyplot_wpf_fork,olegtarasov/oxyplot,Rustemt/oxyplot,TheAlmightyBob/oxyplot,lynxkor/oxyplot,bbqchickenrobot/oxyplot,freudenthal/oxyplot,mattleibow/oxyplot,Jonarw/oxyplot,GeertvanHorrik/oxyplot,TheAlmightyBob/oxyplot,br111an/oxyplot,TheAlmightyBob/oxyplot,olegtarasov/oxyplot