add: SetHighColor(ui_color(B_PANEL_BACKGROUND_COLOR)); FillRect(updateRect);
context: 	virtual	void	Draw(BRect updateRect)					{//				printf("HelloView::Draw()\n");//				updateRect.PrintToStream();//						SetHighColor(ui_color(B_PANEL_BACKGROUND_COLOR));//						FillRect(updateRect);						BRect r(Bounds());//				r.PrintToStream();						const char* message = "Hello World!";						float width = StringWidth(message);						BPoint p(r.left + r.Width() / 2.0 - width / 2.0,								 r.top + r.Height() / 2.0);						SetHighColor(255, 0, 0, 128);						DrawString(message, p);					}