Added ability to save active items.
Added ability to save active items.

OpenChemistry/tomviz,yijiang1/tomviz,yijiang1/tomviz,Hovden/tomviz,mathturtle/tomviz,Hovden/tomviz,cryos/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,cjh1/tomviz,thewtex/tomviz,cryos/tomviz,thewtex/tomviz,cjh1/tomviz,OpenChemistry/tomviz,cryos/tomviz,mathturtle/tomviz,cjh1/tomviz,thewtex/tomviz,OpenChemistry/tomviz