Author: Maarten de Haan

If you work with a RichEdit and you set the property PlainText to True, then you 
can get formatted text into your RichEdit when you use: 

RichEdit1.PasteFromClipboard;

Because you set PlainText to True, you are not able to "unformat" this text again. 
A work around for this problem is using the procedure below. (This is a well known 
bug! On the site of Borland you'll find another - but very complicated - work 
around at: http://codecentral.borland.com/codecentral/ccweb.exe/listing?id=13345)

Answer:
1   
2   //----------------------------------------------------------------------
3   procedure TForm1.EditPasteClick(Sender: TObject);
4   
5   var
6     h: THandle;
7     pchP: PChar;
8     asS0: ANSIstring;
9   
10  begin
11    ClipBoard.Open;
12    try
13      h := Clipboard.GetAsHandle(CF_TEXT);
14      pchP := GlobalLock(h);
15      asS0 := StrPas(pchP);
16      GlobalUnlock(h);
17    finally
18      Clipboard.Close;
19    end;
20    if Length(asS0) > 0 then
21      RichEdit1.SelText := asS0; // Copy in where the cursor / caret is.
22  end;
23  //----------------------------------------------------------------------