Unable to select/click items in wxListBox

Hello. I'm having trouble selecting and/or clicking items in wxListBox only 
if it's part of a sizer. I basically want the wxListBox to expand with the 
window.

Here is the code:















*MainFrame::MainFrame(const wxString& title)    : wxFrame(nullptr, 
wxID_ANY, title),      mainPanel(new wxPanel(this, wxID_ANY, 
wxDefaultPosition, wxSize(300, 200))){ Bind(wxEVT_CLOSE_WINDOW, 
&MainFrame::OnClose, this); SetFont(GetFont().Scale(1.5)); mainPanel = new 
wxPanel(this, wxID_ANY, wxDefaultPosition, wxSize(600, 600)); s1 = new 
wxBoxSizer(wxVERTICAL); m_tgeListBox = new wxListBox(this, wxID_ANY, 
wxDefaultPosition, wxSize(300, 200)); s1->Add(m_tgeListBox, 1, wxEXPAND); 
SetSizerAndFit(s1);}*

Why is this happening and how can it be solved?

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