Compound properties description of the Compound entity properties

## Description

The `Compound` entity is a third of the graphics entities hierarchy. This entity defines interdependencies of the various graphics entities and their global visibility property.

parent:

  This property contains the handle of the parent. The parent of the text entity should be of the type `"Axes"` or `"Compound"`.

children:

  A vector containing the handles of all graphics objects children of the `Compound`. These graphics objects can be of type `"Compound"`, `"Rectangle"`, `"Polyline"`, `"Patch"`, `"Segs"`, `"Arc"`, `"Grayplot"`, ...

visible:

  This field contains the `visible` property value for the entity. It should be `"on"` or `"off"`. By default, value is `"on"` where graphics entities children of the `Compound` are drawn according to their visibility property. If `"off"` all children of `Compound` are not displayed on the screen.

user_data:

  This field can be use to store any scilab variable in the figure data structure, and to retrieve it.

## See also

- glue
- unglue
- graphics entities