Thank you for reporting this problem.
After our investigation on this issue, we found that the Grid will use the first item on the list to fire a GridCommand if either the OnCommand or OnUserAction client-side events are attached.
Until the issue is fixed, please use the "e.CommandArgument" property to access the correct item index, then use that index to access the correct GridItem from the Items collection.
protected void RadGrid1_ItemCommand(object sender, GridCommandEventArgs e)
if (e.CommandName == "MyCommand")
// e.Item.ItemIndex = 0 // wrong index
// e.CommandArgument = "9" // correct index
// Correct ItemIndex
int itemIndex = int.Parse(e.CommandArgument.ToString());
// access item by the correct itemIndex
var dataItem = (sender as RadGrid).Items[itemIndex];
// get the data key value of the correct item
var orderId = dataItem.GetDataKeyValue("OrderID");