I have created a combo check box in one of my dialog boxes in my application. When I use the combo check box the first time, it works fine. However, when I open the dialog box the second time and try to use the combo check box, the check box beside each option is not able to work. Does anyone know what the problem could be? Thank you for your help.

Since you don't show how that is created/implemented, have a look at this to see what you might be missing:
http://www.codeproject.com/combobox/checkcombo.asp

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Thanks. I've managed to find a solution. The combo box was created in a property page, and the property page was not deleted each time the dialog box was closed whereas the combo box was created each time the dialog box was activated. Creating the property page each time the dialog box is activated along with the combo box solves the problem.