Ext.Net.GridPanel with CheckboxSelectionModel - select multiple records via checkbox or Ctrl+Click, otherwise, single-select

[DanGarkusha]

How can configure GridPannel so that it allows selection of multiple rows by selecting them via checkboxes or by Ctr+Click?
Clicking on any other cell in the row should select just that one row (and deselect all other rows) a la File Explorer.