I also tried going back to the original code ..
Private Sub Combo15_AfterUpdate()
Dim sAppID As String
sAppID = Me.Combo15
Me.AppID.SetFocus
DoCmd.FindRecord sAppID, acAnywhere, , acSearchAll
End Sub
It shows the first line in yellow highlight and it has .SetFocus in blue highlight stating that "Compile Error: Method or Data Member not found"