How to use the continuum.ui.ProjectExplorerWidget function in continuum

def __init__(self, project):
        super(ProjectExplorerWidget, self).__init__()
        self.project = project
        self._tform = None
        self._qwidget = None
        self._ui = None

def create_proj_explorer(self, project):
        """Creates the project explorer "sidebar" widget."""
        self.project_explorer = ProjectExplorerWidget(project)
        self.project_explorer.Show("continuum project")
        self.project_explorer.refresh_project_clicked.connect(self.refresh_project)
        self.project_explorer.focus_instance_clicked.connect(
            lambda idb_path: self.core.client.send_focus_instance(idb_path)
        )
        idaapi.set_dock_pos("continuum project", "Functions window", idaapi.DP_BOTTOM)