Due to different browser implementations of checkbox and normalization of its behavior by pqGrid for beforeCheck, check events,
, click event on pqGrid's checkbox columns in IE can't be provided.
Click event can be used on checkbox created in render callback:
http://jsfiddle.net/9cx1xsut/1/checkbox can have only 3 states: checked, unchecked and undefined(indeterminate). If you need modifier key information while click on a checkbox, probably you need to rethink the need for a checkbox and use some other column.