请教关于界面的问题.(100分)

我想不用MDI,而使主窗体永远显示在最底层,该如何解决.

用ShowModal打开新窗体即可。

form1.ShowModal

设计期设定窗体是STAY ON TOP

未必就要用showmodal的，实际上一个窗体可以用另一个窗体做容器的

我说的是用模式打开窗体,并不用设计期设定窗体是STAY ON TOP

当然可以实现，建议使用以下API函数：
BOOL SetWindowPos(

HWND hWnd, // handle of window
HWND hWndInsertAfter, // placement-order handle
int X, // horizontal position
int Y, // vertical position
int cx, // width
int cy, // height
UINT uFlags // window-positioning flags
);


Parameters

hWnd

Identifies the window.

hWndInsertAfter

Identifies the window to precede the positioned window in the Z order. This parameter must be a window handle or one of the following values:

Value Meaning
HWND_BOTTOM Places the window at the bottom of the Z order. If the hWnd parameter identifies a topmost window, the window loses its topmost status and is placed at the bottom of all other windows.
HWND_NOTOPMOST Places the window above all non-topmost windows (that is, behind all topmost windows). This flag has no effect if the window is already a non-topmost window.
HWND_TOP Places the window at the top of the Z order.
HWND_TOPMOST Places the window above all non-topmost windows. The window maintains its topmost position even when it is deactivated.


For more information about how this parameter is used, see the following Remarks section.

X

Specifies the new position of the left side of the window.

Y

Specifies the new position of the top of the window.

cx

Specifies the new width of the window, in pixels.

cy

Specifies the new height of the window, in pixels.

uFlags

Specifies the window sizing and positioning flags. This parameter can be a combination of the following values:

Value Meaning
SWP_DRAWFRAME Draws a frame (defined in the window's class description) around the window.
SWP_FRAMECHANGED Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.
SWP_HIDEWINDOW Hides the window.
SWP_NOACTIVATE Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter parameter).
SWP_NOCOPYBITS Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.
SWP_NOMOVE Retains the current position (ignores the X and Y parameters).
SWP_NOOWNERZORDER Does not change the owner window's position in the Z order.
SWP_NOREDRAW Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.
SWP_NOREPOSITION Same as the SWP_NOOWNERZORDER flag.
SWP_NOSENDCHANGING Prevents the window from receiving the WM_WINDOWPOSCHANGING message.
SWP_NOSIZE Retains the current size (ignores the cx and cy parameters).
SWP_NOZORDER Retains the current Z order (ignores the hWndInsertAfter parameter).
SWP_SHOWWINDOW Displays the window.


Return Values

If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

If the SWP_SHOWWINDOW or SWP_HIDEWINDOW flag is set, the window cannot be moved or sized.
All coordinates for child windows are client coordinates (relative to the upper-left corner of the parent window's client area).
A window can be made a topmost window either by setting the hWndInsertAfter parameter to HWND_TOPMOST and ensuring that the SWP_NOZORDER flag is not set, or by setting a window's position in the Z order so that it is above any existing topmost windows. When a non-topmost window is made topmost, its owned windows are also made topmost. Its owners, however, are not changed.

If neither the SWP_NOACTIVATE nor SWP_NOZORDER flag is specified (that is, when the application requests that a window be simultaneously activated and its position in the Z order changed), the value specified in hWndInsertAfter is used only in the following circumstances:

?Neither the HWND_TOPMOST nor HWND_NOTOPMOST flag is specified in hWndInsertAfter.
?The window identified by hWnd is not the active window.



An application cannot activate an inactive window without also bringing it to the top of the Z order. Applications can change an activated window's position in the Z order without restrictions, or it can activate a window and then move it to the top of the topmost or non-topmost windows.
If a topmost window is repositioned to the bottom (HWND_BOTTOM) of the Z order or after any non-topmost window, it is no longer topmost. When a topmost window is made non-topmost, its owners and its owned windows are also made non-topmost windows.

A non-topmost window can own a topmost window, but the reverse cannot occur. Any window (for example, a dialog box) owned by a topmost window is itself made a topmost window, to ensure that all owned windows stay above their owner.
If an application is not in the foreground, and should be in the foreground, it must call the SetForegroundWindow function.

See Also

MoveWindow, SetActiveWindow, SetForegroundWindow

其实，只要在创建其他窗体的时候，加上
aform.FormStyle := fsStayOnTop;
就可以了。
创建其他窗体的时候可以如下：

var
AForm: TForm2;
begin
AForm := tform2.Create(self);
aform.FormStyle := fsStayOnTop;
aform.Show;
end;

我主窗创建后,SetWindowPos( Handle, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOSIZE);
为什么还达不到要求,请教!

FormChild.Parent:=FormMain;
FormChild.SHow;

form1.showmodal;