Whenever, a listgrid is created with selectionAppearance: "checkbox" and the data is grouped below problem occurs.
When data is grouped and you select checkbox to select all records, initially the checkboxes would be selected but if you close and re-open any group the selection of the checkboxes for that group would disappear.
When data is grouped and you select checkbox to select all records, initially the checkboxes would be selected but if you close and re-open any group the selection of the checkboxes for that group would disappear.