Fixed shared_canvas example to allow editing
Fixed shared_canvas example to allow editing

ejeschke/ginga,stscieisenhamer/ginga,ejeschke/ginga,naojsoft/ginga,pllim/ginga,stscieisenhamer/ginga,stscieisenhamer/ginga,naojsoft/ginga,naojsoft/ginga,pllim/ginga,pllim/ginga,rupak0577/ginga,rupak0577/ginga,ejeschke/ginga,rupak0577/ginga