CTXResizeDialog

In our application, we "dock" dialogs together. When we do this, we remove the titlebar. The casuses the resize grip to be positioned up the dialog (see image),

We have tried resizing the window to allow for this (see commented out code below). The code that hides the caption follows:  Any sugesstions?

    // Get Size
    GetWindowRect(rectInst);

    // Get current style
    DWORD style = GetStyle ();

    // If we are already showing the caption, no further action
    if(style & WS_CAPTION)
    {
        // Hide the Caption
        ModifyStyle(WS_CAPTION, 0, 0);

        // Decrease  the size of the window to allow for the caption
        int nCaption = GetSystemMetrics(SM_CYCAPTION);
        // SetWindowPos(&wndTopMost, 0, 0, rectInst.Width(), rectInst.Height() - nCaption, SWP_NOMOVE);
        // OnSize(SIZE_MAXSHOW, rectInst.Width(), rectInst.Height() - nCaption);


        // Redraw the window
        Invalidate();

    }