How can I detect my datagridview

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VB

hi all
i have a codes for selecting right cell in datagridview when datagridview cell changed or press enter key

but codes running always when i press enter key

how can i do this only i'm in datagridview ?

What I have tried:

Private KeyHandled As Boolean
   Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As Boolean
       If FAT_TABLO.RowCount = 0 Then Exit Function

       Dim icolumn As Integer = FAT_TABLO.CurrentCell.ColumnIndex
       Dim irow As Integer = FAT_TABLO.CurrentCell.RowIndex

       If keyData = Keys.Enter Then
           If icolumn = FAT_TABLO.Columns.Count - 1 Then
               FAT_TABLO.Rows.Add()
               FAT_TABLO.CurrentCell = FAT_TABLO(0, irow + 1)
           Else
               FAT_TABLO.CurrentCell = FAT_TABLO(icolumn + 1, irow)
           End If
           Return True
       Else
           Return MyBase.ProcessCmdKey(msg, keyData)
       End If
   End Function