This example demonstrates ParamQuery support for checkbox columns.

• A grid can have one or more checkbox columns. A normal column is converted to checkbox column by adding type: 'checkbox' property to it.
• Checkbox state can be bound to a field with boolean (true / false) or any string values e.g., "YES" / "NO".
• Custom rendering of the checkbox cells is done by implementing column.render callback in absence of which plain checkboxes are rendered by the grid.
• Custom rendering of the checkbox header cells is done by adding custom markup in the title of the column. It's required to add cb: {header: true} for checkbox to appear and process in the column title or header.
• It's possible to copy/paste and track history of checkbox columns like any other normal cell.
• Checkboxes can be disabled or make editable/ uneditable based on a condition based on row's data.