Wht the cylinder's surface is not filled?

Hi.
I want wo draw a column, a solid column, not a wired column. Here is my code:


void DrawPillar(GLdouble radius, GLdouble length)
{
	GLUquadricObj *pObj;	// Quadric Object

	pObj = gluNewQuadric();
	gluQuadricDrawStyle(pObj, GLU_FILL);
	gluQuadricNormals(pObj, GLU_SMOOTH);
	//gluQuadricOrientation(pObj, GLU_OUTSIDE);
	//gluQuadricTexture(pObj, GLU_FALSE);

	gluCylinder( pObj, radius, radius, length, 20, 20 );
	glPushMatrix();
		gluDisk( pObj, 0, radius, 10, 10 );
		glTranslatef( 0.0f, 0.0f, length );
		gluDisk( pObj, 0, radius, 10, 10 );
	glPopMatrix();
}
 

But the surface is still outlined,I get a wired column. Is there any setting to be met before I call my function?

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE) - wireframe
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL) - fill

for more details
http://www.opengl.org/sdk/docs/man/xhtml/glPolygonMode.xml