Private Sub dgv_MouseLeave(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles dgv.MouseLeave
        For x As Integer = 0 To dgv.ColumnCount - 1
            For y As Integer = 0 To dgv.RowCount - 1
                If dgv.Rows(y).Cells(x).Style.BackColor = Color.Black Then
                    dgv.Rows(y).Cells(x).Style.BackColor = Color.White
                End If
            Next
        Next
    End Sub