Bar Graph Object Options allows the inhibit draw for the Object to be set.

Inhibit Draw

For Inhibit draw, set the tag to be used and the state to be monitored to allow/disallow the drawing.

For the selected Tag, if Draw Object when Tag is not in Alarm is set, the object will only be drawn when the tag is not in Alarm.
For the selected Tag, if Draw Object when Tag is in Alarm is set, the object will only be drawn when the tag is in Alarm.

This allows objects to be drawn on top of each other and only shown depending on the alarm state of a tag.