Bug 251257 [Contributions] IAction.setImageDescriptor() javadoc needs to note "image vs. checked" platform discrepancy
bundles/org.eclipse.jface/src/org/eclipse/jface/action/IAction.java
/**
     * Action style constant (value <code>1</code>) indicating action is 
     * a simple push button.
     */
    public static int AS_PUSH_BUTTON = 0x01;
    /**
     * Action style constant (value <code>2</code>) indicating action is 
     * a check box (or a toggle button).
     */
    public static int AS_CHECK_BOX = 0x02;
    /**
     * Action style constant (value <code>4</code>) indicating action is 
     * a drop down menu.
     */
    public static int AS_DROP_DOWN_MENU = 0x04;
    /**
     * Action style constant (value <code>8</code>) indicating action is 
     * a radio button.
     * 
     * @since 2.1
     */
    public static int AS_RADIO_BUTTON = 0x08;
    /**
     * Property name of an action's text (value <code>"text"</code>).
     */
    public static final String TEXT = "text"; 
    /**
     * Property name of an action's enabled state
     * (value <code>"enabled"</code>).
     */