def METHOD_NAME(self):
    #custom additional html head tags
    my_html_head = """<title>Bootstrap Test</title>"""
    #Load Boostrap Ressources from Online Source
    #One could download the files and put them into res folder for access without internet connection
    #Not all the Bootstrap functionality will work!! Just basic styling is possible.
    #For valid Bootstrap Classes check:  https://www.w3schools.com/bootstrap/bootstrap_ref_all_classes.asp
    #custom css
    my_css_head = """
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
        """
    #custom js
    my_js_head = """
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
        """
    #appending elements to page header
    self.page.children['head'].add_child('myhtml', my_html_head)
    self.page.children['head'].add_child('mycss', my_css_head)
    self.page.children['head'].add_child('myjs', my_js_head)
    #creating a container VBox type, vertical (you can use also HBox or Widget)
    main_container = gui.VBox(width='500px', height='500px', style={'margin':'0px auto','padding':'10px'})
    #Label
    self.lbl = gui.Label("  Label with Lock Icon")
    self.lbl.add_class("glyphicon glyphicon-lock label label-primary")
    #Text Input
    self.tf = gui.TextInput(hint='Your Input')
    self.tf.add_class("form-control input-lg")
    #Drop Down
    self.dd = gui.DropDown(width='200px')
    self.dd.style.update({'font-size':'large'})
    self.dd.add_class("form-control dropdown")
    self.item1 = gui.DropDownItem("First Choice")
    self.item2 = gui.DropDownItem("Second Item")
    self.dd.append(self.item1,'item1')
    self.dd.append(self.item2,'item2')
    #Table
    myList = [  ('ID','Lastname','Firstname','ZIP','City'),
                ('1','Pan','Peter','99999','Neverland'),
                ('2','Sepp','Schmuck','12345','Examplecity')  ]
    self.tbl = gui.Table.new_from_list(content=myList,width='400px',height='100px',margin='10px')
    self.tbl.add_class("table table-striped")
    #Buttons
    #btn adds basic design to a button like rounded corners and stuff
    #btn-success, btn-danger and similar adds theming based on the function
    #if you use btn-success without btn, the button will be standard, but with green background
    self.bt1 = gui.Button("OK", width="100px")
    self.bt1.add_class("btn-success")                   #Bootstrap Class:  btn-success
    self.bt2 = gui.Button("Abbruch",width="100px")
    self.bt2.add_class("btn btn-danger")                #Bootstrap Class:  btn btn-danger
    #Build up the gui
    main_container.append(self.lbl,'lbl')
    main_container.append(self.tf,'tf')
    main_container.append(self.dd,'dd')
    main_container.append(self.tbl,'tbl')
    main_container.append(self.bt1,'btn1')
    main_container.append(self.bt2,'btn2')
    # returning the root widget
    return main_container