procedure TForm1.PageControl1DrawTab(Control: TCustomTabControl;
TabIndex: Integer; const Rect: TRect; Active: Boolean);
begin
if Active then
begin
Control.Canvas.Brush.Color := clAqua;
Control.Canvas.Font.Color := clWhite;
end;
Control.Canvas.TextRect(Rect, Rect.Left + 5, Rect.Top + 5, PageControl1.ActivePage.Caption);
PageControl1.Canvas.Rectangle(0,20,Control.Width,Control.Height);//加这句就可以了
end;