wxPython adding/removing controls during runtime to ScrolledWindow

Question

I'm trying to add/remove multiple items to a ScrolledWindow in wxPython .
At the moment I have the following control architecture:

I want to add multiple instances of the resultItem_panel to the result_scrolledWindow .
When I do so I first have to scale the window manually by dragging it with the cursor for it to update and the result_scrolledWindow to show the scroll bars.
My code at the moment:

def __addPublication(self, pub: Publication) -> None:
    resultItem_panel = ResultItemPanel(self, pub)

    # Add to parent sizer:
    self.result_sizer.Add(resultItem_panel, 0, wx.ALL, 5)
    self.Layout()
    self.Parent.Fit()

    # Store it so we later can Destroy() it again:
    self.resultItemPanels.append(resultItem_panel)

def clearPublications(self) -> None:
    for pub in self.resultItemPanels:
        pub.Destroy()
    self.resultItemPanels = []

    self.Layout()
    self.Parent.Fit()

What am I doing wrong here?

Answer 1

Replacing:

self.Layout()
self.Parent.Fit()

with:

self.result_sizer.Layout()
self.PostSizeEvent()

did the trick for me.
Reference: Phoenix (wxPython) #1221