hjælp med event fejl

Har denne kode:

TShape *snakebite = new TShape(Owner);
snakebite->Shape = stRectangle;
snakebite->Width = 10;
snakebite->Height = 10;
snakebite->Left = frmMain->ClientWidth / 2;
snakebite->Top = frmMain->ClientHeight / 2;
snakebite->Name = String("Bite" + String(NR));
snakebite->OnMouseDown = myOnMouseDownEvent;
frmMain->InsertControl(snakebite);
}

void __fastcall TfrmMain::myOnMouseDownEvent(System::TObject* Sender, TMouseButton
Button, Classes::TShiftState Shift, int X, int Y);
{
  // kode kode kode kode
}

jeg får en masse fejl når jeg compiler...
E2451 Undefined symbol 'myOnMouseEvent'
E2316 'TfrmMain::myOnMouseDownEvent(TObject *, TMouseButton, TShiftState, int, int)' is not a member of 'TfrmMain'
E2040 Declaration terminated incorrectly

Hvad er der galt??