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    <p>You can use the message handling capability of a VCL control and send the relevant messages to one another. I don't know about a 'TcxTreeList', but the following demonstrates the idea on an edit control and a memo control responding to keyboard events synchronously (whereever possible of course).</p> <pre><code>type TEdit = class(stdctrls.TEdit) private FMsgCtrl: TWinControl; FRecursing: Boolean; procedure WmChar(var Msg: TWMChar); message WM_CHAR; procedure WmKeyDown(var Msg: TWMKeyDown); message WM_KEYDOWN; procedure WmKeyUp(var Msg: TWMKeyUp); message WM_KEYUP; end; TMemo = class(stdctrls.TMemo) private FMsgCtrl: TWinControl; FRecursing: Boolean; procedure WmChar(var Msg: TWMChar); message WM_CHAR; procedure WmKeyDown(var Msg: TWMKeyDown); message WM_KEYDOWN; procedure WmKeyUp(var Msg: TWMKeyUp); message WM_KEYUP; end; TForm1 = class(TForm) Edit1: TEdit; Memo1: TMemo; procedure FormCreate(Sender: TObject); private public end; var Form1: TForm1; implementation {$R *.dfm} { TEdit } procedure TEdit.WmChar(var Msg: TWMChar); begin if not FRecursing then begin inherited; // Insert test here to see if the message will be forwarded // exit/modify accordingly. if Assigned(FMsgCtrl) then begin FRecursing := True; try FMsgCtrl.Perform(Msg.Msg, MakeWParam(Msg.CharCode, Msg.Unused), Msg.KeyData); finally FRecursing := False; end; end; end; end; procedure TEdit.WmKeyDown(var Msg: TWMKeyDown); begin // exact same contents as in the above procedure end; procedure TEdit.WmKeyUp(var Msg: TWMKeyUp); begin // same here end; { TMemo } procedure TMemo.WmChar(var Msg: TWMChar); begin // same here end; procedure TMemo.WmKeyDown(var Msg: TWMKeyDown); begin // same here end; procedure TMemo.WmKeyUp(var Msg: TWMKeyUp); begin // same here end; { TForm1 } procedure TForm1.FormCreate(Sender: TObject); begin Edit1.FMsgCtrl := Memo1; Memo1.FMsgCtrl := Edit1; end; </code></pre> <p>You might need to intervene additional messages but you get the idea.</p> <p>If for one reason or another you cannot derive a new control or override message handling, you can consider sub-classing the controls. Answer to <a href="https://stackoverflow.com/questions/3302389/synchronized-scrolling-components-delphi">this question</a> would show you how to do that.</p>
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    1. POForwarding keyboard events from one Windows control to another
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    1. USSertac Akyuz
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    1. COStrange, but using the Perform method of a TEdit still has no effect - just like the SendMessage example in my OP. Even trying something simple like always sending a backspace key (where the edit control has text and caret position is > 0 ) does nothing: edit1.Perform( WM_KEYDOWN, 8, 0 );
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      1. USMarek Jedliński
    2. CO@mood - Try `edit1.Perform(WM_CHAR, VK_BACK, 0);` for backspace. That's why included WM_CHAR, WM_KEYDOWN, WM_KEYUP messages in the sample project.
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