Hi Hristo, 

Thank you for your quick response. 

Yes I have some records in the WebHierarchicalDataGrid with no child grid and in both version there are no expand indicator. 

I am using BatchUpdating and use javascript to add new child rows. Here are some of my code: 

EditingCore behaviors setting are as follow:

parent grid:

<igtbl:EditingCore BatchUpdating="true" AutoCRUD="false">
</igtbl:EditingCore>

child band:

<igtbl:EditingCore BatchUpdating="true" AutoCRUD="false" EnableChildlessRowsPopulation="true">
</igtbl:EditingCore>

And here is the js function:

function addNewChildRow(gridName) {
    var grid = $find(gridName);
    var gridBehaviors = grid.get_gridView().get_behaviors();
    var parentRow = gridBehaviors.get_selection().get_selectedRows().getItem(0);
if (parentRow == null) {
    parentRow = grid.get_behaviors().get_activation().get_activeCellResolved().get_row();
}

var childGrid = parentRow.get_rowIslands()[0];
var row = new Array(childGrid.get_columns().get_length());
for (var i = 0; i < row.length; i++) {
row[i] = null;
}
    childGrid.get_rows().add(row);
    parentRow.set_expanded(true);
}

The bold line above doesn't work in the updated version. var childGrid is null here, the row island do not exist. 

So how can I get the row island? Or maybe the right question should be how to create one? 

Regards,

KC