Datagridview format rows

I want my datagridview to have one row formatted with 2 decimals and second row should not have decimals at all (the values should be rounded).

I use such code

Private
 Sub
 FormatTotalGrid( _
        ByVal
 PercFormat As
 String
, _
        ByVal
 SumFormat As
 String
, _
        ByVal
 dgvSrc As
 DataGridView)


        dgvSrc.Rows(0).DefaultCellStyle.Format = PercFormat
        
        dgvSrc.Rows(1).DefaultCellStyle.Format = SumFormat

        'dgvSrc.Refresh()


    End
 Sub

The problem: I noticed that datagridview should be displayed at least once before such changes can be applied. My datagridviews are on tabpages which are not active at the moment when application starts. So user needs to go to every tabpage and only then I can reapply styles to datagriviews I need to change.

Why such things are happening? Formatting works fine while I format columns. But if I start format rows or cells the formattin is not applied until the control is displayed at least once.

Be cool! Help a noob

Datagridview format rows

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