VB.Net ListView Grouping Font Size / Font Bold

I am using the following sub in VB.Net to group data in a Windows Forms ListView.

Passing the data to sub from MySql query. I have been able to group the data by Employee Number - Name as shown in the image below:

My question is How to Make the header stand out more. 

The first header 474 Blake, Jorge font is Too small -- have not been able to figure out how to make bigger or possibly Bold it. I have tried making the text size within the ListView object bigger but has no effect on the grouping text size.

Let me know how to resolve

Thanks  - Dan

    Public Sub GroupByEmpNo(ByVal lstV As System.Windows.Forms.ListView, ByVal SubItemIndex As Int16)
        Dim flag As Boolean = True

        For Each l As ListViewItem In lstV.Items
            Dim strmyGroupname As String = l.SubItems(SubItemIndex).Text
            For Each lvg As ListViewGroup In lstV.Groups
                If lvg.Name = strmyGroupname Then
                    l.Group = lvg
                    flag = False
                End If
            Next

            If flag = True Then
                Dim lstGrp As New ListViewGroup(strmyGroupname, strmyGroupname)
                lstV.Groups.Add(lstGrp)
                l.Group = lstGrp
            End If
            flag = True
        Next
    End Sub

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