The read-only property of flexbox containers is not well propagated

[gcoutable]

Steps to reproduce

1. Create a blank studio, a view model, and, a form description on flow::System
2. Add a FlexboxContainer to the existing group
3. Fill its details with at least aql:false in the Is Enable Expression
4. Add two Textfield widget in the flexbox container to display the name of the System
5. Set the second Textfield widget Is Enable Expression to aql:false
6. Create a new project with a flow model
7. Create the Form representation

Expected Result

Both Textfields are disabled

Actual Result

Only the second Textfield is disabled