fires before an inner view of spreadsheet is initialized
| id | string|number | the inner view ID | 
| config | object | the object with a view configuration | 
webix.ui({
    view:"spreadsheet",
    data:spreadsheet_data,
    on:{
        onViewInit:function(view, config){
            if (view == "toolbar" && window.innerWidth < 1400){
                config.elements = [{
                    view:"scrollview",
                    scroll:"x",
                    body:{ cols:config.elements }
                }];
            }
        }
    }
});
The event can be used to make changes in the UI of inner components, e.g. the toolbar, the context menu or the bottom bar.