A Visualforce chart. Defines general characteristics of the chart, including size and data binding.
How do you call Web Services from external sources? (No Answer)
What two methods of customization are available to create applications in salesforce?
A button that is rendered as an HTML input element with the type attribute set to submit, reset, or image, depending on the <apex:commandButton> tag's specified values. The button executes an action defined by a controller, and then either refreshes the current page, or navigates to a different page based on the PageReference variable that is returned by the action.
An <apex:commandButton> component must always be a child of an <apex:form> component.
See also: <apex:commandLink>