Creating a tabbed group with TidyTabs

Here is how to group several windows into a tabbed group with TidyTabs:

When a window is not in a group, its tab is invisible by default. To make it appear, place your mouse cursor over it.
Grab the window by its tab and drop it onto the tab of another window.
The two windows are now merged into a new tabbed group.
Reproduce the previous steps as many times as you want to add more windows to the group.

Note: Creating a tabbed group of more than three windows is only possible with the Professional Edition of TidyTabs.