openGL-nie wyswietla sie okienko

#include <GL\glut.h>

using namespace std;
void Display()
{
    glClearColor(1.0,1.0,1.0,1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_POLYGON);
    glColor3f(0,0.1,0.1);
    glVertex3f(0.1,0.1,0);
    glColor3f(0,0.2,0.2);
    glVertex3f(0.2,0.2,0);
    glColor3f(0,0.3,0.3);
    glVertex3f(0.3,0.3,0);
    glColor3f(0,0.4,0.4);
    glVertex3f(0.4,0.4,0);
    glEnd();
    glFlush();
    glutSwapBuffers();
}

void Reshape(int widht,int height)
{
    Display();
}
int main(int argc,char * argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GL_DOUBLE|GL_RGB);
    glutInitWindowSize(500,500);

    glutCreateWindow("nazwa");
     glutInitWindowPosition(20,30);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0,500,500,0);
    glutDisplayFunc(Display);
    glutReshapeFunc(Reshape);

    glutMainLoop;


    return 0;
}