How to empty DataViewCtrl

hello, reading docs I thought to use mydvc.GetModel().Cleared() but it seems is not enough. For example with DVC_IndexListModel demo script, go to to WidgetInspector, select the DataViewCtrl object and in PyCrust put obj.GetModel().Cleared(): the content of the object remains the same. Is there some else to be done to obtain an empty control? (win10, wxpy4.1,py3.7)

Thanks in advance, Marco

ok, cleared is like a refresh, I have to change model content