Create CWnd problem

[TOMNKZ]

hi.
i create cwnd derived class.

Create(NULL,_T("Errors"),WS_CHILD|WS_CAPTION|WS_MAXIMIZE|WS_MINIMIZE|WS_OVERLAPPED,CRect(100,100,500,500),&CWnd(GetDesktopWindow()),0);

In OnCreate of this window i create CListCtrl and button.

But when i call ShowWindow(SW_SHOW), i see my window icon in task bar,but when i press it,i see window area with copy of my desktop screen,why?