If a Placeholder is in the visual tree of a Group, it represents the area of all of the member Parts of that Group.
If a Placeholder is in the visual tree of an Adornment, it represents the area of the Adornment.adornedObject.
It can only be used in the visual tree of a Group node or an Adornment.
There can be at most one Placeholder in a Group or an Adornment.
See the documentation for Group and Adornment for descriptions of the Placeholder roles in each.
If a Placeholder is in the visual tree of a Group, it represents the area of all of the member Parts of that Group. If a Placeholder is in the visual tree of an Adornment, it represents the area of the Adornment.adornedObject. It can only be used in the visual tree of a Group node or an Adornment. There can be at most one Placeholder in a Group or an Adornment.
See the documentation for Group and Adornment for descriptions of the Placeholder roles in each.