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.