access violation with std::list

//IRPanel.h

#include <wx/wx.h>
#include <list>;

class IRPanel : public wxPanel
{
public:
    IRPanel(wxWindow* parent);

    void OnPaint(wxPaintEvent& event);
	void OnSize(wxSizeEvent & event);
	void CalcAxisValues();
private:
	wxString XLabel;
	wxString YLabel;
	std::list<double> XAxisValues;
	std::list<double> YAxisValues;
	std::list<wxString> XAxisLabels;
	std::list<wxString> YAxislabels;
	std::list<int> XAxisLabelsXPos;
	std::list<int> YAxisLabelsYPos;
	int XAxisLabelsYPos;
	int YAxisLabelsXPos;
	int ClientWidth, ClientHeighth;
	int XLabelLength, XLabelHeighth,YLabelWidth, YLabelHeighth,LabelSpacer,AxisSpacer,NumXLabels;
	int AxisLabelFontSize, AxisValuesFontSize, AxisArrowSize;
	double FirstX,LastX,MinX,MaxX,FirstY,LastY,MinY,MaxY, XDif, YDif, AbsXDif, AbsYDif;

};

//IRPanel.cpp, only constructor for now

#include "IRPanel.h"


IRPanel::IRPanel(wxWindow* parent)
: wxPanel (parent, wxID_ANY,wxDefaultPosition, wxDefaultSize,wxFULL_REPAINT_ON_RESIZE,wxT(""))
{
  this->Connect(wxEVT_PAINT, wxPaintEventHandler(IRPanel::OnPaint));
  this->Connect(wxEVT_SIZE, wxSizeEventHandler(IRPanel::OnSize));
  XLabel=wxT("X-Label");
  YLabel=wxT("Y-Label");
  GetTextExtent(XLabel, &XLabelLength, &XLabelHeighth,(int*)0, (int*)0,wxSWISS_FONT);
  GetTextExtent(YLabel, &YLabelWidth, &YLabelHeighth,(int*)0, (int*)0,wxSWISS_FONT);
  LabelSpacer=5;
  AxisSpacer=2*YLabelHeighth+3*LabelSpacer; //distance of axis to window border
  AxisLabelFontSize=10;
  AxisValuesFontSize=10;
  AxisArrowSize=5;
  FirstX=-1400;
  LastX=400;
  MinX=0;
  MaxX=1;
  FirstY=0;
  LastY=1;
  MinY=0;
  MaxY=100;
  XAxisValues.push_back(FirstX); //here it all goes wrong
  XAxisLabels.push_back(wxT("label"));//this works!
  XAxisLabelsXPos.push_back(AxisSpacer);//this too.
}