bgtest.cpp

#include <wx/wxprec.h>

#ifndef WX_PRECOMP
    #include <wx/wx.h>
#endif

class MyApp: public wxApp
{
public:
    virtual bool OnInit();
};

class MainFrame: public wxFrame
{
public:
    MainFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
private:
    wxButton * button;
    wxTextCtrl * text;
    void OnChangeBgClicked(wxCommandEvent& event);
    DECLARE_EVENT_TABLE();
};

enum
{
    ID_CHANGE_BG_BUTTON = 1
};

BEGIN_EVENT_TABLE(MainFrame, wxFrame)
    EVT_BUTTON(ID_CHANGE_BG_BUTTON, MainFrame::OnChangeBgClicked)
END_EVENT_TABLE()

IMPLEMENT_APP(MyApp);

bool MyApp::OnInit()
{
    MainFrame *frame = new MainFrame(wxT("bgtest"), wxPoint(50, 50), wxSize(450, 340));
    frame->Show(true);
    return true;
}

MainFrame::MainFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
        : wxFrame(NULL, wxID_ANY, title, pos, size)
{
    this->button = new wxButton(this, ID_CHANGE_BG_BUTTON, wxT("change bg"));

    this->text = new wxTextCtrl(this, wxID_ANY);

    wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
    sizer->Add(this->button);
    sizer->Add(this->text);
    SetSizerAndFit(sizer);
}

void MainFrame::OnChangeBgClicked(wxCommandEvent& event)
{
    this->text->SetBackgroundColour(wxT("pink"));
}