To allow a component form to be accessed from a host database a setting must be accessed from the Form's Properties in the Explorer as shown in the image below.



The form's properties window will then open:



By default the "Published as subform in the host database" setting is disabled. When a form is developed in a component and is designed to be used by a host database this setting should be enabled.

When the setting is enabled, a host database can load the form as a subform as shown below the sample "ComponentForm" is listed.