In Interactive Creo Parametric, Combined View can be hiden or shown.
There is no ProToolkit API to query and/or manage hidden status of combined view.
API ProModelitemIsHidden() does not work.It will return PRO_TK_INVALID_TYPE.
According to PTC support,
ProModelitem and ProCombstate objects (and number of other objects) have/share same generic structure but it does not mean that the functions related to ProModelitem can be applied to ProCombstate as well.
Please provide API to query hidden status, and also ability to show/hide ProCombstate.