I tried to implement the Form_Open() property as indicated, but it doesn't work for me.
My main form is a NavigationSubForm, Assets.
My Continuous Sub-Form is Asset_Groups
Both are using the same table.
The subform is linked to the master based on a common text field called Group. It shows a list of all other assets which have the same value in Group
I suspect the syntax for your solution needs to be modified to account for NavigationSubForms, but I don't know how to do that. Can you?