I can get the DataKey using the RowCommand Event but I want to be able
to put the OnClick attribute into the Row and have it alert the KeyID.
When I try to get the value of KeyID that I got in RowCommand it comes
back with a null value. The only way I can find to add an attribute to
a row is during the RowDataBound Event.

Public Class _MasterTestBed
   Inherits System.Web.UI.Page
   Dim KeyID As String
   Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e
As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles
GridView1.RowCommand
       KeyID = GridView1.DataKeys(e.CommandArgument).Value.ToString
   End Sub

   Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal
e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles
GridView1.RowDataBound
       If (e.Row.RowType = DataControlRowType.DataRow) Then
           e.Row.Attributes.Add("onMouseOver",
"this.style.backgroundColor='lightgrey'")
           e.Row.Attributes.Add("onMouseOut",
"this.style.backgroundColor='Transparent'")
           e.Row.Attributes.Add("onClick", "alert('" + KeyID + "')'")
       End If
   End Sub
End Class