Virtual StringTree：OnGetHint事件处理程序返回的文本未显示在提示窗口中

Question

我为Virtual StringTree控件的OnGetHint事件编写了一个处理程序，我确定返回了提示文本，但是提示窗口是空白的，请参阅下面的截图，可能是什么原因引起了这个问题？提前谢谢你。

控件的设置：

AnimationDuration := 0;
ClipboardFormats.Clear;
ClipboardFormats.Add('HTML Format');
ClipboardFormats.Add('Plain text');
ClipboardFormats.Add('Rich Text Format');
ClipboardFormats.Add('Rich Text Format Without Objects');
ClipboardFormats.Add('Unicode text');
ClipboardFormats.Add('Virtual Tree Data');
DefaultPasteMode := amInsertBefore;
DragOperations := [doCopy, doMove, doLink];
EditDelay := 200;
HintMode := hmHint;
Images := dmImages.lstProjectTree;
IncrementalSearch := isAll;
Indent := 16;
Margin := 0;
ParentFont := False;
PopupMenu := pmTree;
SelectionCurveRadius := 5;
OnCollapsed := treePrjCollapsed;
OnColumnClick := treePrjColumnClick;
OnDblClick := treePrjDblClick;
OnDragAllowed := treePrjDragAllowed;
OnDragOver := treePrjDragOver;
OnDragDrop := treePrjDragDrop;
OnExpanded := treePrjExpanded;
OnFocusChanged := treePrjFocusChanged;
OnGetCursor := treePrjGetCursor;
OnGetText := treePrjGetText;
OnPaintText := treePrjPaintText;
OnGetImageIndexEx := treePrjGetImageIndexEx;
OnGetHint := treePrjGetHint;
OnKeyDown := treePrjKeyDown;
OnMouseDown := treePrjMouseDown;
OnNewText := treePrjNewText;
OnNodeMoving := treePrjNodeMoving;
with Columns.Add do begin
  Position := 0;
  Width := 153;
end;
with Columns.Add do begin
  Layout := blGlyphRight;
  MinWidth := 20;
  Position := 1;
  Width := 20;
end;
with Columns.Add do begin
  Layout := blGlyphRight;
  MinWidth := 20;
  Position := 2;
  Width := 20;
end;
with Columns.Add do begin
  Layout := blGlyphRight;
  MinWidth := 16;
  Position := 3;
  Width := 20;
end;

Answer 1

我自己找到了问题的罪魁祸首！这是AnimationDuration：= 0

正如Rob建议的那样，我将这个发现添加为答案，以便我接受它。