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    <p>In my application, I also use multiple MDI Parents. Below is my magic code, where the different Childs have different states, in each Parent.</p> <p>This code is adopted from: <a href="http://cc.embarcadero.com/item/23574" rel="nofollow">ID: 23574, Multiple MDI Parent Forms in a single Application</a></p> <pre><code>//Add multiple MDIForm support TFormMDIEnhance = class(TForm) private _mdiClientHandle: HWND; function GetMDIClientHandle: HWND; protected procedure CreateWindowHandle(const Params: TCreateParams); override; procedure DestroyWindowHandle; override; end; procedure TFormMDIEnhance.CreateWindowHandle(const Params: TCreateParams); var mdiStruct: MDICREATESTRUCT; begin _mdiClientHandle := GetMDIClientHandle; if (FormStyle = fsMDIChild) then begin mdiStruct.szClass := Params.WinClassName; mdiStruct.szTitle := Params.Caption; mdiStruct.hOwner := HInstance; mdiStruct.x := Params.X; mdiStruct.y := Params.Y; mdiStruct.cx := Params.Width; mdiStruct.cy := Params.Height; mdiStruct.style := Params.Style; mdiStruct.lParam := LPARAM(Params.Param); WindowHandle := SendStructMessage(_mdiClientHandle, WM_MDICREATE, 0, mdiStruct); Include(FFormState, fsCreatedMDIChild); end else inherited CreateWindowHandle(Params); end; procedure TFormMDIEnhance.DestroyWindowHandle; begin if fsCreatedMDIChild in FFormState then SendMessage(_mdiClientHandle, WM_MDIDESTROY, Handle, 0) else inherited DestroyWindowHandle; _mdiClientHandle := 0; end; function TFormMDIEnhance.GetMDIClientHandle: HWND; var fm: TForm; begin result := 0; if Owner is TForm then begin fm := Owner as TForm; if Assigned(fm) then Result := fm.ClientHandle; end; if (Result = 0) and Assigned(Application.MainForm) then Result := Application.MainForm.ClientHandle; if Result = 0 then raise EInvalidOperation.Create(SNoMDIForm); end; </code></pre> <p>Inherit your forms from that Base form, then you can create multiple MDI Parents. Maybe that helps.</p>
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    1. PODelphi Multiple MDI Children causes window state change
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    1. USmarkus_ja
    1. USmarkus_ja
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    1. COYep I have multiple MDI Parents. I want the WindowState behaviour of the MDI children to be different in a parent. So first MDI Child is wsMax'd and the second is wsNormal... I have posted some code, see my above comment... Any thoughts welcome!
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    2. COYou cannot do that with MDI. That is a Microsoft limitation. If one child is maximized, then all other children must also be maximized. that is just how MDI works.
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      1. USRemy Lebeau
 

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