When we create a toolbar from within the event handler of another toolbar several times (so we have a chain of embedded toolbars) and the last toolbar is destroyed, gs_liveToolbar variable is reset in its dtor what prevents from executing the part of code in MSWCommand() for other existing toolbars if they are still in their event handlers too (still executing OnLeftClick() function). This may happen when toolbars are created in the chain of modal dialog boxes.
To prevent this interference between the toolbars from occurring we have to keep track of all of active toolbars in the chain instead of keeping track of only the last one.
Closes#18309.
66b798692e