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    <p>As per the comments, here is an example of how you can avoid the problem by handling <code>KeyPress</code> events instead of manually converting <code>KeyDown</code> events. The TNT controls don't provide a <code>WideChar</code> <code>KeyPress</code> event, but it's fairly easy to add. Ideally, you should not put the extensions to <code>TTntMemo</code> and <code>TTntForm</code> in derived classes as I've done here, but instead modify the TNT source code.</p> <p>The form contains two <code>TTntMemo</code> controls. Pressing keys in the first will log the events in the second.</p> <pre><code>unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, TntForms, StdCtrls, TntStdCtrls; type TKeyPressWEvent = procedure(Sender: TObject; var Key: WideChar) of object; TTntMemo = class(TntStdCtrls.TTntMemo) private FOnKeyPressW: TKeyPressWEvent; procedure WMChar(var Msg: TWMChar); message WM_CHAR; protected function DoKeyPressW(var Message: TWMKey): Boolean; procedure KeyPressW(var Key: WideChar); published property OnKeyPressW: TKeyPressWEvent read FOnKeyPressW write FOnKeyPressW; end; TTntForm = class(TntForms.TTntForm) private FOnKeyPressW: TKeyPressWEvent; procedure WMChar(var Msg: TWMChar); message WM_CHAR; protected function DoKeyPressW(var Message: TWMKey): Boolean; procedure KeyPressW(var Key: WideChar); published property OnKeyPressW: TKeyPressWEvent read FOnKeyPressW write FOnKeyPressW; end; TForm1 = class(TTntForm) TntMemo1: TTntMemo; TntMemo2: TTntMemo; procedure FormCreate(Sender: TObject); procedure FormKeyPressW(Sender: TObject; var Key: WideChar); procedure TntMemo1KeyPressW(Sender: TObject; var Key: WideChar); end; var Form1: TForm1; implementation uses TntControls; {$R *.dfm} type TWinControlAccess = class(TWinControl); TTntFormAccess = class(TTntForm); function TntControl_DoKeyPressW(Self: TWinControl; var Message: TWMKey; KeyPressW: Pointer): Boolean; type TKeyPressWProc = procedure(Self: TWinControl; var Key: WideChar); var Form: TCustomForm; Ch: WideChar; begin Result := True; Form := GetParentForm(Self); if (Form &lt;&gt; nil) and (Form &lt;&gt; Self) and Form.KeyPreview then begin if (Form is TTntForm) and TTntFormAccess(Form).DoKeyPressW(Message) then Exit; if TWinControlAccess(Form).DoKeyPress(Message) then Exit; end; if not (csNoStdEvents in Self.ControlStyle) then begin Ch := GetWideCharFromWMCharMsg(Message); TKeyPressWProc(KeyPressW)(Self, Ch); SetWideCharForWMCharMsg(Message, Ch); if Ch = #0 then Exit; end; Result := False; end; { TTntMemo } function TTntMemo.DoKeyPressW(var Message: TWMKey): Boolean; begin Result := TntControl_DoKeyPressW(Self, Message, @TTntMemo.KeyPressW); end; procedure TTntMemo.KeyPressW(var Key: WideChar); begin if Assigned(FOnKeyPressW) then FOnKeyPressW(Self, Key); end; procedure TTntMemo.WMChar(var Msg: TWMChar); begin if not DoKeyPressW(Msg) then inherited; end; { TTntForm } function TTntForm.DoKeyPressW(var Message: TWMKey): Boolean; begin Result := TntControl_DoKeyPressW(Self, Message, @TTntForm.KeyPressW); end; procedure TTntForm.KeyPressW(var Key: WideChar); begin if Assigned(FOnKeyPressW) then FOnKeyPressW(Self, Key); end; procedure TTntForm.WMChar(var Msg: TWMChar); begin if not DoKeyPressW(Msg) then inherited; end; { TForm1 } procedure TForm1.FormCreate(Sender: TObject); begin Self.OnKeyPressW := FormKeyPressW; TntMemo1.OnKeyPressW := TntMemo1KeyPressW; end; procedure TForm1.FormKeyPressW(Sender: TObject; var Key: WideChar); begin TntMemo2.Lines.Add(WideString('FormKeyPress: ') + Key); end; procedure TForm1.TntMemo1KeyPressW(Sender: TObject; var Key: WideChar); begin TntMemo2.Lines.Add(WideString('TntMemo1KeyPress: ') + Key); end; end. </code></pre>
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