Drag tab between two FlexLayout instances (FlexLayout with a drawer)

[borglin]

I'm trying to create a layout where you can toggle a drawer on or off but I still want the drawer content to use FlexLayout, so I can move tabs in and out of the drawer. Since I haven't found a way to show/hide a Tabset or to programatically add an entire Tabset with tabs, I tried to add a second FlexLayout instance inside the drawer but then I can't move tabs out of the drawer. Is there a way to allow tabs to be dragged between instances?

Here is an example of what I'm trying to do https://jsfiddle.net/borglinm/3mpjow28/