Build 4.0.0.53 of xlsgen fixes a problem related to creating group outlines in XLSX and XLSB files. The problem did not reproduce with XLS files.

Group outlines is this mechanism for grouping and then expanding or collapsing a continuous group of rows, or group of columns. Setting the group as collapsed did not work in scenarios where XLSX or XLSB files were being created. This is now fixed.

Sample code (C++) :

xlsgen::IXlsRangePtr range1 = wksht->NewRange(L"R8C3:R10C3");
xlsgen::IXlsOutlinePtr outline = range1->NewOutline();
outline->VerticalOutlineLevel = xlsgen::outline_level1;
outline->VerticalOutlineUpsideDown = TRUE;
outline->VerticalOutlineExpand = FALSE;