I manage to delete rows client side, but have refresh grid issue. Let say I have 5 rows and delete 3 rows on client. When loop thru rows collection on client it still shows 5 rows.

var rowgrid = $find("UltraWebGrid1");
var rows = rowgrid.get_rows().get_length();

alert(rows);

I am deleting rows like this:

var grid = $find('<%= UltraWebGrid1.ClientID %>');
var gridRows = grid.get_rows();
var selectedRows = grid.get_behaviors().get_selection().get_selectedRows();

var rows = new Array();

var i1 = 0;

for (var i = selectedRows.get_length() - 1; i >= 0; i--) {

rows[i1] = selectedRows.getItem(i);
i1++;
}

grid.get_behaviors().get_editingCore().get_behaviors().get_rowDeleting().deleteRows(rows);

Rows are deleting from grid on screen, but still in rows collection when I loop later.