SendMessage(_hwnd, TTM_ADDTOOL, 0, (LPARAM)&ti);
	void add(HWND hparent, HWND htool, LPCTSTR txt=LPSTR_TEXTCALLBACK)	{		TOOLINFO ti = {			sizeof(TOOLINFO), TTF_SUBCLASS|TTF_IDISHWND/*|TTF_TRANSPARENT*/, hparent, (UINT)htool, {0,0,0,0}, 0, 0, 0		};		ti.lpszText = (LPTSTR) txt;		SendMessage(_hwnd, TTM_ADDTOOL, 0, (LPARAM)&ti);	}