Enable excel 2003 Command Buttons in excel 2007

I have programmed VBA command buttons in an excel 2003 file, and want to know how to use them in excel 2007. I have saved the file as Macro-Enabled workbook, and enabled macro execution through Trust Center settings. I can see each of the Command Buttons code programming by right-clicking on any of them. But there is no way to click on the buttons and execute the code programmed for each of them. Any idea how to enable these commands buttons in excel 2007?

Hi, I continued investigating the issue and finally found an explanation: All Comand Buttons that were created using excel 2003, appear as "Locked" when the file is opened in excel 2007. So the solution is as follows: 1) Open the file in excel 2007, go to "Design Mode" and open the visual basic window. 2) Open the "Properties" window and review the status of line "Locked" for all CommandButton's. Status must be changed from True to False in order to enable CommandButton execution.