Background Shape:
Ellipse
Rectangle
Rounded Rectangle

Symbol Shape:
Plus Minus
Up-Down Arrow
Up-Down Triangle
Up-Down Double Arrow
Up-Down Double Triangle
Right-Down Arrow
Right-Down Triangle

Position:
Left
Right

The show-hide subtree decorator is a decorator, which consists of a symbol and background. Clicking the expand-collapse decorator toggles the visibility state of the shape destination shapes and the outgoing shapes. When hiding the subtree, this process is repeated for each destination shape. When showing the subtree this process is repeated for each destination shape if the ShowChildrenOnly property is set to false.