Default constructor, only used by parser.

Friend Sub New()
Friend Sub New(
    parent As MenuGroup, 
    revision As Revision
)
Public Sub New(
    toolbarIn As QuickAccessToolbar, 
    parent As MenuGroup, 
    index As Integer
)

internal QuickAccessToolbar();
internal QuickAccessToolbar(
    MenuGroup parent, 
    Revision revision
);
public QuickAccessToolbar(
    QuickAccessToolbar toolbarIn, 
    MenuGroup parent, 
    int index
);