(API) Right Positioned Dialogs?

[zhunter]

API newbie, been writing a program using info from online tutorials etc. I am now working on a modeless child dialog box that I would like to be attached to the right side of the main window.

I've been designing my dialogs using the graphical editor in VC6, but I can't seem to find a way to achieve the right positioning style of my dialog (and I don't mean the "right-aligned" dialog option for text and such).

What I do know is how to adjust an MDI window's size in WinProc's WM_SIZE case, where I calculate certain parameters (parent window size, toolbar size) to alter the MDI window's size.

I tried the same approach using my DIALOG:

LRESULT CALLBACK WndProc(...)
{
...
CASE WM_SIZE:
{
...

   HWND hDlg;
   RECT rcClient;

   GetClientRect(hwnd, &rcClient);
   Height = // ...
   Width = //...

   hDlg = GetDlgItem(hwnd, DIALOG);
   SetWindowPos(hDlg, NULL, etc ..., SWP_NOZORDER);
}

But while this works fine for my MDI windows, which are created within my program, this method has no effect on my DIALOG.

Something I'm missing?