ComboBox

ComboBox class ehances the MFC CComboBox class by adding the following features:

1. Tooltip for items in the drop-down list.
2. Tooltip for the main CComboBox window.
3. Can disable specific items in the ComboBox.
4. Can set disabled text color and background color.
5. Able to set custom colors for all items.
6. Able to set a different custom colors for each item on the list.
7. Able to set option to produce a tooltip popup window only when string is too wide to fit in the ComboBox.