Hi!
This was a bug in Axure 8 as well. Groups have their own opacity setting, just as widgets within groups do. When you set the opacity of a group, it should not affect the opacity of objects within that group.
If you use the opacity slider in the Style tab on a group, it sets the opacity of each widget within the group instead of the opacity of the group itself. (That opacity remains at 100% if you examine it through code.)
Whereas if you set the opacity of the group using the Set Opacity command, it properly sets the opacity of the group itself, not each widget in the group.
The picture below demonstrates this issue. There are two groups containing gray rectangles sitting above purple ellipses that are in neither group. The top group was set to 50% opacity using the opacity slider in the Style tab. The bottom group was set to 50% using the Set Opacity command.
In the top one, each rectangle is transparent: you can see the back rectangle through the front one. The group’s opacity is 100% and each rectangle’s opacity is 50%.
In the bottom one, the group’s opacity is 50%, and each rectangle’s opacity is 100%. Notice you can’t see the back rectangle through the front one.
The latter should be the behavior of the opacity slider when acting upon a group.
