These are additional examples that you should try on your own, then check if you have problems.
Area: Pick height and width on scroll bars. One sub handles both events to calculate area. text, zip
Color: A message box is used to ask the user if he likes red. text, zip
Names (1): The user types a name in the text box then clicks Add. If the name is not null the name is added to a list box
When the user clicks clear, a message box is used to ask if he really wants to clear. text
Names (2): The user clicks Add. An input box is shown to let he user type the name. If the name is not null the name is added to a list box. text, zip
Dialogs: Dialog boxes are used to select font and color. An input box is used for a message. text, zip