How to get if an Infragistic unboundDataCheckbox is checked in WebGridData WebForms ASP.Net

I can't believe that after more than 3 hours of searching I haven't found any clear reference to how to obtain and modify the status of an Infragistic checkbox in a WebForms WebGridData, ASP.NET, I have tried everything, but it doesn't work, it would very helpful if someone could point me to some of this, greetings