### Declaring a context id

The setHelp method in org.eclipse.ui.help.WorkbenchHelp is used to associate a context id with a Control, IAction, Menu, or MenuItem. The context id should be fully qualified with the plug-in id. For example, the following snippet associates the id "com.example.helpexample.panic_button" with a button in the application.

    WorkbenchHelp.setHelp(myButton, com.example.helpexample.panic_button);

The following UI controls cannot have context ids (and therefore cannot have infopops):

- Toolbar buttons (ToolItem)
- CTabItem
- TabItem
- TableColumn
- TableItem
- TableTreeItem
- TreeItem

Widgets that do not get focus should not be assigned context ids, since they will never trigger an infopop.