Yes, I have do it by SetWindowPos. Just after I call this function, the ATL extenter has been resized(become smaller). But I click in the original rect of the ATL extenter, the ATL become the original size as same as before calling SetWindowPos. In fact I want to call SetWindowRgn to make a irregular ATL control, but I cannot because the same reason as above. Click the ATL, it become back to previous shape. cz

Dear Masaaki Onishi, Thank you very much. Yes, I want a control to display the data. Actualy I am making a ATL control and the ATL control hold one Grid that accept format string in that pattern. The common usage is a VB project, which is the client of ATL COM control, opens one database and get one recordset, and then pass it into ATL control. Of course I can loop through whole recordset, read variant from every fields and assemble a CString by myself, but that is too tiresome. If you have waked up now has have a good mood, give me a advice. thank you. chenzhu :-O