Example of using AUI with a panel (and not a frame)

aui-panel.cpp

#include <wx/app.h>
#include <wx/frame.h>
#include <wx/panel.h>
#include <wx/sizer.h>
#include <wx/textctrl.h>

#include <wx/aui/aui.h>

class TestPanel : public wxPanel {
public:
    explicit TestPanel(wxWindow* parent) : wxPanel(parent, wxID_ANY) {
        m_manager.SetManagedWindow(this);
        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Central pane"), wxAuiPaneInfo().CenterPane());
        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Left pane"), wxAuiPaneInfo().Left().Layer(1).MinSize(FromDIP(wxSize(200, 100))).Caption("Left pane").CloseButton());
        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Bottom pane"), wxAuiPaneInfo().Bottom().Layer(2).MinSize(FromDIP(wxSize(200, 100))).Caption("Bottom pane").MaximizeButton());
        m_manager.Update();
    }

private:
    wxAuiManager m_manager;
};

class TestApp : public wxApp {
public:
    bool OnInit() override {
        auto f = new wxFrame(nullptr, wxID_ANY, "Window containing AUI panel");
        auto t = new wxTextCtrl(f, wxID_ANY, "Just a text", wxDefaultPosition, wxDefaultSize, wxTE_MULTILINE);
        auto p = new TestPanel(f);
        auto s = new wxBoxSizer(wxHORIZONTAL);
        s->Add(t, wxSizerFlags().Expand());
        s->Add(p, wxSizerFlags(1).Expand());
        f->SetSizer(s);
        f->SetClientSize(f->FromDIP(wxSize(800, 600)));

        f->Show();
        return true;
    }
};

wxIMPLEMENT_APP(TestApp);