How to get the Child Form in a Master Detail Form Pic Tab in IFS10

tbwCustomerOrderLine tte = ((tbwCustomerOrderLine)SalWindow.FromHandle(TabAttachedWindowHandleGet(picTab.FindName(Const.TAB_CustOrdLines)), typeof(tbwCustomerOrderLine)));

nRow = Sys.TBL_MinRow;
while (Sal.TblFindNextRow(tte, ref nRow, 0, 0))
{
	Sal.TblSetContext(tte, nRow);
	MessageBox.Show(tte.colsCatalogNo.Text);
}

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How to get Parent Form in Master Detail Form in IFS10