有谁熟悉TFlowChart的？如何给里面的图形加上hint?

[IOsetting]

谁用过TFlowChart？
里面一个类是这样定义的：
TdxFcItem = class(TPersistent)
private
FOwner: TdxCustomFlowChart;
FText: String;
FFont: TFont;
FRealFont: TFont;
FParentFont: Boolean;
FDestroying: Boolean;
FSelected: Boolean;
FRepainted: Boolean;
procedure OnFontChange(Sender: TObject);
procedure SetRealFont;
procedure SetFont(Value: TFont);
procedure SetParentFont(Value: Boolean);
procedure SetSelected(Value: Boolean);
protected
function SelList: TList; virtual; abstract;
procedure Changed;
procedure FontChanged; virtual;
procedure Invalidate; virtual; abstract;
procedure LoadFont(Stream: TStream);
procedure SaveFont(Stream: TStream);
procedure SetText(Value: String); virtual; abstract;
procedure ScaleFont;
property RealFont: TFont read FRealFont;
public
constructor Create(AOwner: TdxCustomFlowChart);
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
property Destroying: Boolean read FDestroying;
property Font: TFont read FFont write SetFont;
property Owner: TdxCustomFlowChart read FOwner;
property ParentFont: Boolean read FParentFont write SetParentFont;
property Selected: Boolean read FSelected write SetSelected;
property Text: String read FText write SetText;
end;

然后TdxFcObject从这个类继承，添加上paint方法。
我想让这个类能实现hint的功能，也就是和Label, button这些都有的那种hint, showhint属性
我改怎样做呢？我试过CM_MouseEnter和CM_MOUSELEAVE，但是没有反应，我也不好把
TPersistent类改成TCustomControl，那样procedure Assign(Source: TPersistent); override;我就不知道怎么改了

[huojiehai]

只有从TControl继承下来的才能接收消息

[IOsetting]

一定要从有DC的类中继承吗？
能不能在TdxFcItem中加入一个可以接收消息的对象呢？

[huojiehai]

在这个类TdxFcItem中做肯定做不到的，你定义hint属性是可以的，但显示还是要在TFlowChart中控制的，很明示TdxFcItem中没有DC, 只有TFlowChart中才有DC