Use ViewMode property instead of gcode3DWidget.Visible
Use ViewMode property instead of gcode3DWidget.Visible

- Issue MatterHackers/MCCentral#2925
GCode rather than Model menu appears as GCode3DWidget remains visible

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