Fix TS problems and make TS improvements in demos (Editors) - part 3#32021

pharret31 wants to merge 3 commits intoDevExpress:25_2DevExpress/DevExtreme:25_2from

pharret31:25_2_2978-fix-ts-problems-and-make-ts-improvements-in-demos-editors-part-3pharret31/DevExtreme:25_2_2978-fix-ts-problems-and-make-ts-improvements-in-demos-editors-part-3Copy head branch name to clipboard