Hi,
I created a master-detail form using the suggested procedure. Both the master and the detail were created as "Grid with Popup form".
I use the search box in the master grid to find a specific master row. After clicking on that row, the detail grid shows the corresponding records.
If I enter the modal form for ANY detail record, I get the correct row in the screen. But on pressing the EDIT button, the underlaying grids are refreshed, and the record on the modal form changes and shows the FIRST detail record.
For example: for master record "100" I had three details, # 1, 2 and 3.
If I select detail record "3", and the press "edit" button, the modal form changes to detail record "1". Also the detail and master grids "blinks" and refreshed. Any search filter is cleared in both grids.
I'm guessing is a bug because this is not the behaviour on the master grid: If I enter the modal form for any record and press EDIT, the record for edition is the same (doesn't changes).
We'll try to reproduce. Get back to you soon.
Reproduced, added to bugtracker.