IVsErrorList::ForceShowErrors Method ()
Visual Studio 2015
Forces errors to appear in the list. Leaves warnings and informational messages alone.
Assembly: Microsoft.VisualStudio.Shell.Interop.8.0 (in Microsoft.VisualStudio.Shell.Interop.8.0.dll)
From vsshell80.idl:
HRESULT IVsErrorList::ForceShowErrors();
Show: