F4 Press event in Grid View

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VB

i have made Manual Grid View
not auto

Private Sub GridViewColums()
       '-----------------DealerCode---------------------
       Dim dgvcDealerCode As New DataGridViewTextBoxColumn
       With dgvcDealerCode
           .Name = "DealerCode"
           .DataPropertyName = "DealerCode"
           .HeaderText = "DealerCode"
           .ReadOnly = True
           .Width = 100
           .DefaultCellStyle.Format = ""
           .DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft
       End With
       GridDetail.Columns.Add(dgvcDealerCode)

i want to Make Event with this GRiD View and Colum
that when i press ""f4"" in this Cell when MsgBox"invalid"

whats event can help in this scnerio ???