mergDatagridscroller on LC 8

[trevix]

Running on ID LC 8.1.0 RC2, OS X 10.11.6

I am recently trying to run my stack (working fine on LC 7.1.4) on LC 8 and I am having a problem with the mergDatagridscroller on the IDE.
Usually it works fine but doing a certain action, a dialog window opens (An error has occurred in behavior for the row template: chunck: no such object) with "OK" and "Edit Script".

Pressing "OK nothing happens, but the data grid does not redraw correctly.

Pressing "Edit script", opens the script of a -button of "Data Grid" of group "behavior" of card "card ID 1002" of stack ...../revDataGridLibrary.rev"- (?) around line
_list.HiliteIndexesInVisibleControls ( 3184), but without selecting an error line.
I tried to intercept it but to no avail.

Note:
- on LC 7 I had DropTools and this stack is present in the substacks of my stack (DropTools_1469000517244, together with the Data grid Template).
- stepping thought the "set the dgData of group "DataGrid 1" to ...", LC simply exit from the script, no message of any sort.

I don't really know how to deal with this.

May be Monte?
Thanks

Trevix