I love the fact that when I want to group two objects, I just have to select them both and give a bit of a shake and they group themselves. However, there are times when I have grouped objects and I accidently shake a bit and they separate. This happens most often when I have created pull tabs. I begin to pull them out and they become ungrouped. To prevent this, after I group, I click on the drop down menu and choose Locking. I then choose Allow move and rotate. Thereafter, my pull tabs remain grouped no matter what I do!