Maybe something as simple as this would work. On click, do your logic to determine whether you want to release or unrelease, then call SetRels(myChoice);
void SetRels(bool Released)
{
EpiDataView edvOrderRel = ((EpiDataView)(this.oTrans.EpiDataViews["OrderRel"]));
// ** Place Event Handling Code Here **
foreach(var row in edvOrderRel.dataView)
{
row["FirmRelease"] = Released;
}
}