Version - DX7

The use case which I am trying to achieve is to have a section to show audit history or notes section where data entered into a Form field or sub form should be saved and shown in a Grid in the same section.

For reference I saw the simple CRM application in market place where they have achieved this in one of the hidden forms called view case under the case menu. In form the data entered into the sub form and saved gets displayed in the Grid.

I tried to replicate the same by creating two forms. In Form 1 I created the text area field & the hidden field for Foreign key and in Form 2 I created the Grid and the sub form for Form 1 and mapped the Grid with Form 1 columns and used the multi row form binder and used the hidden field (case) as the foreign key. 

When I tried running the app after the form is saved the grid remains empty and the data entered in the sub form is not displayed in the gird. Please advise on a solution.