Keeping tabs in Tabbar loaded


I migrated recently all the way from dhtmlx 3.6 and I can’t seem to find a way to keep tabs loaded in the memory when they’re not selected.
I have iframes inside the tab content and it looks like it’s reloading each time I switch tabs.
How can I avoid that and keep them loaded when they’re not selected ?


Unfortunately due to the VDOM usage, it is not available to keep the tabs in memory after the tab change