#include <windows.h>
#include <stdio.h>
int WINAPI WinMain (HINSTANCE hThisInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpszArgument,
                     int nFunsterStil)
 
{
HWND hWnd;
    for(;;)
    {
        MSG Msg;
        while(GetMessage(&Msg, NULL, 0, 0)){
            if(Msg.message == WM_KEYUP && Msg.wParam == VK_TAB){
                PostMessage(Msg.hwnd, WM_PASTE, 0, 0);
                printf("K\n"); //Never shows this == not entering the if statment ... why ?
                // you might need to try GetFocus() instead of Msg.hwnd
            }              
            if(!IsDialogMessage(hWnd, &Msg)){
                TranslateMessage(&Msg);
                DispatchMessage(&Msg);
            }
        }
    }
    return 0;
}