I have rendered a checkbox in the header of a datagrid column
using headerRenderer property. That column also has all entries as
checkboxes. What I want to do is that on checking the header
checkbox, all checkboxes should get checked. Though I am able to do
this BUT the header checkbox remains uncheched in the whole
process! Whereas, if I remove this eventHandler from it, then the
header checkbox shows the correct state i.e., show checked on
checking & unchecked on unchecking!