We have made a few changes to the way attached windows behave. These enhancements make collapsing and expanding families of attached windows more intuitive.
In addition, you now only need to click the title bar of a window once to expand or collapse it.
Note: To attach a window to another, 
-drag the title bar until the edge snaps to the edge of the other window. Only windows that can remain open regardless of the current action can be attached. Option boxes and tool control windows cannot be attached.
-drag the title bar until the edge snaps to the edge of the other window. Only windows that can remain open regardless of the current action can be attached. Option boxes and tool control windows cannot be attached. In the list of enhancements below, parent refers to the window with the dark gray title bar, that other windows have been attached to. Children refer to all the windows attached to the parent, and which move along when the parent is moved.
- The auto-hide state of the parent window now applies to all its children.
- The collapse direction of the parent window (left/right/up/down arrow) automatically applies to all its children.
- When a family of windows collapses to the left or right, clicking the title bar of any window in the family collapses or expands all of them.
One click expands all the windows in the family.