How can i change default Hint Window?

[mbekle]

I'm using Borland C++ Builder 6.

1 - I write following codes in "Unit1.h"
-------------------------------------------
class TNewHintWindow : public THintWindow
{

};
--------------------------------------------

2 - I write following codes in "Unit1.cpp"
--------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{

HintWindowClass = __classid(TNewHintWindow);
}
--------------------------------------------

When I running the application, that error shows :
"[Linker Error] Unresolved external '__fastcall Controls::THintWindow::NCPaint(void *)' referenced from C:\PROGRAM FILES\BORLAND\CBUILDER6\PROJECTS\UNIT1.OBJ"


How can I solve this problem?

Thanks for your helps...