MipMap Issue

Hi,

I have loaded geometry from a custom file format and rendering. Everything is working fine with the exception of MipMapping. It isn't happening.

Can someone point out if there is anything wrong with the following steps I am taking:

When the file is loaded I create a texure like this:

m_TextureHandles[0] = TextureHandle(fileName, BitmapTexture);

When objectRender is called I set the texture like this:

glEnable(GL_TEXTURE_2D);
 glEnable(GL_CULL_FACE);
 glEnable(GL_ALPHA_TEST);
 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);


 glBindTexture(GL_TEXTURE_2D, m_TextureHandles[0].getGLName());

Thanks
Todd

Edit:
I should have pointed out that I am using .png files.

Also, I just noticed the following snippet in the png loader:

allocateBitmap(width, height,
false, // don't extrude miplevels...
format); // use determined format...

Are miplevels not created for textures loaded from .png files?
If so, why?

Thanks
Todd