wxPython Layout problems

ui.py

import gettext
# end wxGlade

# begin wxGlade: extracode
import wx
# end wxGlade



class PlotCard(wx.Panel):
    def __init__(self, *args, **kwds):
        # begin wxGlade: PlotCard.__init__
        kwds["style"] = kwds.get("style", 0) | wx.TAB_TRAVERSAL
        wx.Panel.__init__(self, *args, **kwds)
        self.SetSize((200, 100))
        self.SetBackgroundColour(wx.Colour(50, 153, 204))
        self.Layout()
        # end wxGlade

# end of class PlotCard
class PlotBoard(wx.ScrolledWindow):
    def __init__(self, *args, **kwds):
        # begin wxGlade: PlotBoard.__init__
        kwds["style"] = kwds.get("style", 0)
        wx.ScrolledWindow.__init__(self, *args, **kwds)
        self.SetMinSize((800, 600))
        self.SetBackgroundColour(wx.Colour(90, 180, 142))
        self.SetScrollRate(10, 10)
        self.EnableScrolling(False, True)
        sizer_2 = wx.WrapSizer(wx.HORIZONTAL)

        self.SetSizer(sizer_2)

        self.Layout()
        self.Bind(wx.EVT_SIZE, self.OnSize, self)
        # end wxGlade

    def AddCard(self):
        sizer: wx.WrapSizer = self.GetSizer()
        box = PlotCard(self)
        size = self.GetClientSize()
        sizer.Add(box, flag=wx.FIXED_MINSIZE | wx.ALL, border=5)
        self.SetVirtualSize(size)
        self.Layout()
        print("items: {}| size: {}".format(sizer.GetItemCount(), size))

    def OnSize(self, event):  # wxGlade: PlotBoard.<event_handler>
        size = self.GetSize()
        sizer_size = self.GetSizer().GetSize()
        self.SetVirtualSize(size)
        self.Layout()
        print("Pane size: {} Sizer size {}".format(size, sizer_size))
        event.Skip()
# end of class PlotBoard

class MyFrame(wx.Frame):
    def __init__(self, *args, **kwds):
        # begin wxGlade: MyFrame.__init__
        kwds["style"] = kwds.get("style", 0) | wx.DEFAULT_FRAME_STYLE
        wx.Frame.__init__(self, *args, **kwds)
        self.SetSize((800, 600))
        self.SetTitle(_("frame"))

        sizer_1 = wx.GridBagSizer(0, 0)

        self.panel_1 = PlotBoard(self, wx.ID_ANY)
        sizer_1.Add(self.panel_1, (0, 0), (1, 1), wx.EXPAND, 0)

        self.button_1 = wx.Button(self, wx.ID_ADD, "")
        sizer_1.Add(self.button_1, (1, 0), (1, 1), 0, 0)

        sizer_1.AddGrowableRow(0)
        sizer_1.AddGrowableCol(0)
        self.SetSizer(sizer_1)

        self.Layout()

        self.Bind(wx.EVT_BUTTON, self.OnButtonAdd, self.button_1)
        # end wxGlade

    def OnButtonAdd(self, event):  # wxGlade: MyFrame.<event_handler>
        self.panel_1.AddCard()


# end of class MyFrame

class MyApp(wx.App):
    def OnInit(self):
        self.frame = MyFrame(None, wx.ID_ANY, "")
        self.SetTopWindow(self.frame)
        self.frame.Show()
        return True

# end of class MyApp


if __name__ == "__main__":
    gettext.install("app") # replace with the appropriate catalog name

    app = MyApp(0)
    app.MainLoop()

Platform linux/wxGTK (wxPython 4.01)
Action:

• Add Elements with the '+ Add' Button

Expected behavior:

• Wrap around horizontally if necessary
• Show Vertical Scrollbar if necessary
• Render each Element inside the visible/scrollable Area

Current behavior:

• If the screen is very wide, elements are rendered off-screen
• no scrollbars are shown