Usually it's possibe to open subsystems by "Open in new tab" by mouse action.
If theese tabs were not closed before saving the model it reopenes in same (all tabs open) way.
I want to create a script (e.g. for usage in pre-save callback), that closes all tabs except the first one.
The necessary command to access theese tabs was not yet found by me.
I'm using ML 2017B with matching Simulink-version.