better actions support

src/dlangui/widgets/menu.d

@@ -188,6 +188,14 @@ class MenuItem {
             res = add(new MenuItem(subitemAction));
         }
         return res;
+    }
+    /// adds submenu item(s) from one or more actions (will return item for last action)
+    MenuItem add(const Action[] subitemActions...) {
+        MenuItem res = null;
+        foreach(subitemAction; subitemActions) {
+            res = add(new MenuItem(subitemAction));
+        }
+        return res;
     }
 	/// returns text description for first accelerator of action; null if no accelerators
 	@property dstring acceleratorText() {
@@ -228,6 +236,10 @@ class MenuItem {
         _action = action;
         _enabled = true;
     }
+    this(const Action action) {
+        _action = action.clone;
+        _enabled = true;
+    }
     ~this() {
         // TODO
     }

src/dlangui/widgets/toolbars.d

@@ -62,7 +62,7 @@ class ToolBarHost : HorizontalLayout {
 
 /// image button for toolbar
 class ToolBarImageButton : ImageButton {
-    this(Action a) {
+    this(const Action a) {
         super(a);
         styleId = STYLE_TOOLBAR_BUTTON;
         focusable = false;
@@ -100,7 +100,7 @@ class ToolBar : HorizontalLayout {
         addChild(widget);
     }
     /// adds image button to toolbar
-    void addButtons(Action[] actions...) {
+    void addButtons(const Action[] actions...) {
         foreach(a; actions) {
             if (a.isSeparator) {
                 addChild(new ToolBarSeparator());