Added images for show docu, show expressions (#1860)

plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/StatechartImages.java

@@ -30,7 +30,11 @@ public enum StatechartImages {
 
 	PRO_EDITION("images/pro.png"),
 
-	MENU("icons/obj16/Menu-16.png"),
+	MENU("icons/obj16/MENU-16.png"),
+	
+	DOCU("icons/obj16/docu-16.png"),
+	
+	EXPR("icons/obj16/expr-16.png"),
 
 	EXPAND("icons/obj16/arrow_right.png"),
 

plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/commands/DocumentationMenuAction.java

@@ -49,8 +49,10 @@ public class DocumentationMenuAction extends Action implements IMenuCreator {
 
 	private void createActions() {
 		Action action = new DocumentationDropDownAction("Show expressions", SGraphPackage.Literals.SPECIFICATION_ELEMENT__SPECIFICATION.getName());
+		action.setImageDescriptor(StatechartImages.EXPR.imageDescriptor());
 		actions.add(action);
 		action = new DocumentationDropDownAction("Show documentation", BasePackage.Literals.DOCUMENTED_ELEMENT__DOCUMENTATION.getName());
+		action.setImageDescriptor(StatechartImages.DOCU.imageDescriptor());
 		actions.add(action);
 	}