larger view****t than device context (DC)?

Hello

I'm trying to render to texture using glCopyTexImage2D (like at NeHe's 
tutorial). It works fine. I thought I could create larger view****t, 
render, and then show that texture resized in window to get something 
like resampling.
But I found the view****t can't be larger than my window and rest of 
screen becomes black. Do you know what should I do to make it right?

First, I create DC like this:

     h_DC := GetDC(Form1.Handle);
     PixelFormat := ChoosePixelFormat(h_DC, @[EMAIL PROTECTED]
);

     if (not SetPixelFormat(h_DC, PixelFormat, @[EMAIL PROTECTED]
)) then
       exit;

     h_RC := wglCreateContext(h_DC);
     if (h_RC = 0) then
       exit;

     if (not wglMakeCurrent(h_DC, h_RC)) then
       exit;


And this is rendering:

   glView****t(0,0,1024,1024);

//here I draw something

   glBindTexture(GL_TEXTURE_2D, RendTexture);
 
glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGB,0,0,rend_tekstura_x,rend_tekstura_y,1);
   glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

   //and again back to first view****t
   glView****t(0,0,form1.ClientWidth,form1.ClientHeight);


It works great, but part of screen is black. The part larger than window.

Thanks ;)
G.