Returns the type of the children supported by the container.
Note that this may return %G_TYPE_NONE to indicate that no more children can be added, e.g. for a #GtkPaned which already has two children.
a #GType.
See Implementation
Returns the type of the children supported by the container.
Note that this may return %G_TYPE_NONE to indicate that no more children can be added, e.g. for a #GtkPaned which already has two children.