[WINAPI] Window in D

[Daniel Wojdak]

My english is not good. Apologize for this.

I start programming in D and i have a problem.
When I try make a window procedure and register class window. Compiler show error: 
"Error: cannot implicitly convert expression (& WindowProcedure) of type intWindows function(HANDLE, uint, uint, int) function(HANDLE hwnd, uint message, uint wParam, int lParam) to intWindows function(HANDLE, uint, uint, int)"

Window Procedure:

"WNDPROC WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     switch (message)
     {

         case WM_DESTROY:
             PostQuitMessage (0);
             break;
         default:
             return cast(WNDPROC) DefWindowProcA (hwnd, message, wParam, lParam);
     }

     return cast(WNDPROC) 0;
}"

How must look window procedure in order to it's work?