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    <p>For those that are interested, here's the code that I ended up using. If you attach this to the OnAfterCellPaint event of a TVirtualStringTree it gives the desired results.</p> <pre><code>(* DrawHTML - Draws text on a canvas using tags based on a simple subset of HTML/CSS &lt;B&gt; - Bold e.g. &lt;B&gt;This is bold&lt;/B&gt; &lt;I&gt; - Italic e.g. &lt;I&gt;This is italic&lt;/I&gt; &lt;U&gt; - Underline e.g. &lt;U&gt;This is underlined&lt;/U&gt; &lt;font-color=x&gt; Font colour e.g. &lt;font-color=clRed&gt;Delphi red&lt;/font-color&gt; &lt;font-color=#FFFFFF&gt;Web white&lt;/font-color&gt; &lt;font-color=$000000&gt;Hex black&lt;/font-color&gt; &lt;font-size=x&gt; Font size e.g. &lt;font-size=30&gt;This is some big text&lt;/font-size&gt; &lt;font-family&gt; Font family e.g. &lt;font-family=Arial&gt;This is arial&lt;/font-family&gt; *) procedure TfrmSNMPMIBBrowser.DrawHTML(const ARect: TRect; const ACanvas: TCanvas; const Text: String); function CloseTag(const ATag: String): String; begin Result := concat('/', ATag); end; function GetTagValue(const ATag: String): String; var p: Integer; begin p := pos('=', ATag); if p = 0 then Result := '' else Result := copy(ATag, p + 1, MaxInt); end; function ColorCodeToColor(const Value: String): TColor; var HexValue: String; begin Result := 0; if Value &lt;&gt; '' then begin if (length(Value) &gt;= 2) and (copy(Uppercase(Value), 1, 2) = 'CL') then begin // Delphi colour Result := StringToColor(Value); end else if Value[1] = '#' then begin // Web colour HexValue := copy(Value, 2, 6); Result := RGB(StrToInt('$'+Copy(HexValue, 1, 2)), StrToInt('$'+Copy(HexValue, 3, 2)), StrToInt('$'+Copy(HexValue, 5, 2))); end else // Hex or decimal colour Result := StrToIntDef(Value, 0); end; end; const TagBold = 'B'; TagItalic = 'I'; TagUnderline = 'U'; TagBreak = 'BR'; TagFontSize = 'FONT-SIZE'; TagFontFamily = 'FONT-FAMILY'; TagFontColour = 'FONT-COLOR'; var x, y, idx, CharWidth, MaxCharHeight: Integer; CurrChar: Char; Tag, TagValue: String; PreviousFontColor: TColor; PreviousFontFamily: String; PreviousFontSize: Integer; begin // Start - required if used with TVirtualStringTree ACanvas.Font.Size := Canvas.Font.Size; ACanvas.Font.Name := Canvas.Font.Name; ACanvas.Font.Color := Canvas.Font.Color; ACanvas.Font.Style := Canvas.Font.Style; // End PreviousFontColor := ACanvas.Font.Color; PreviousFontFamily := ACanvas.Font.Name; PreviousFontSize := ACanvas.Font.Size; x := ARect.Left; y := ARect.Top; idx := 1; MaxCharHeight := ACanvas.TextHeight('Ag'); While idx &lt;= length(Text) do begin CurrChar := Text[idx]; // Is this a tag? if CurrChar = '&lt;' then begin Tag := ''; inc(idx); // Find the end of then tag while (Text[idx] &lt;&gt; '&gt;') and (idx &lt;= length(Text)) do begin Tag := concat(Tag, UpperCase(Text[idx])); inc(idx); end; /////////////////////////////////////////////////// // Simple tags /////////////////////////////////////////////////// if Tag = TagBold then ACanvas.Font.Style := ACanvas.Font.Style + [fsBold] else if Tag = TagItalic then ACanvas.Font.Style := ACanvas.Font.Style + [fsItalic] else if Tag = TagUnderline then ACanvas.Font.Style := ACanvas.Font.Style + [fsUnderline] else if Tag = TagBreak then begin x := ARect.Left; inc(y, MaxCharHeight); end else /////////////////////////////////////////////////// // Closing tags /////////////////////////////////////////////////// if Tag = CloseTag(TagBold) then ACanvas.Font.Style := ACanvas.Font.Style - [fsBold] else if Tag = CloseTag(TagItalic) then ACanvas.Font.Style := ACanvas.Font.Style - [fsItalic] else if Tag = CloseTag(TagUnderline) then ACanvas.Font.Style := ACanvas.Font.Style - [fsUnderline] else if Tag = CloseTag(TagFontSize) then ACanvas.Font.Size := PreviousFontSize else if Tag = CloseTag(TagFontFamily) then ACanvas.Font.Name := PreviousFontFamily else if Tag = CloseTag(TagFontColour) then ACanvas.Font.Color := PreviousFontColor else /////////////////////////////////////////////////// // Tags with values /////////////////////////////////////////////////// begin // Get the tag value (everything after '=') TagValue := GetTagValue(Tag); if TagValue &lt;&gt; '' then begin // Remove the value from the tag Tag := copy(Tag, 1, pos('=', Tag) - 1); if Tag = TagFontSize then begin PreviousFontSize := ACanvas.Font.Size; ACanvas.Font.Size := StrToIntDef(TagValue, ACanvas.Font.Size); end else if Tag = TagFontFamily then begin PreviousFontFamily := ACanvas.Font.Name; ACanvas.Font.Name := TagValue; end; if Tag = TagFontColour then begin PreviousFontColor := ACanvas.Font.Color; ACanvas.Font.Color := ColorCodeToColor(TagValue); end; end; end; end else // Draw the character if it's not a ctrl char if CurrChar &gt;= #32 then begin CharWidth := ACanvas.TextWidth(CurrChar); if x + CharWidth &gt; ARect.Right then begin x := ARect.Left; inc(y, MaxCharHeight); end; if y + MaxCharHeight &lt; ARect.Bottom then begin ACanvas.Brush.Style := bsClear; ACanvas.TextOut(x, y, CurrChar); end; x := x + CharWidth; end; inc(idx); end; end; </code></pre>
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