Bug 7235 [Contributions] Need dispose() for action delegates
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ContributionItem.java
}
/**
 * The default implementation of this <code>IContributionItem</code>
 * method returns <code>false</code>. Subclasses may override.
 */
public boolean isGroupMarker() {
	return false;
}
/**
 * The default implementation of this <code>IContributionItem</code>
 * method returns <code>false</code>. Subclasses may override.
 */
public boolean isSeparator() {
	return false;
}
/**
 * The default implementation of this <code>IContributionItem</code>
 * method returns the value recorded in an internal state variable,
 * which is <code>true</code> by default. <code>setVisible</code>
 * should be used to change this setting.
 */
public boolean isVisible() {
	return visible;
}
/**
 * The default implementation of this <code>IContributionItem</code>
 * method stores the value in an internal state variable,
 * which is <code>true</code> by default.
 */
public void setVisible(boolean visible) {