Remove Invalidate from OnDraw call
Remove Invalidate from OnDraw call

- Issue MatterHackers/MCCentral#3347
Invalidate should not be invoked from Draw

unlimitedbacon/MatterControl,larsbrubaker/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,mmoening/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl