diff --git a/src/main/haxework/color/Color.hx b/src/main/haxework/color/Color.hx
index 931f43e..884baf3 100644
--- a/src/main/haxework/color/Color.hx
+++ b/src/main/haxework/color/Color.hx
@@ -44,7 +44,25 @@ abstract Color(Int) {
     }
 
     @:from static public inline function fromString(value:String):Color {
-        return new Color(Std.parseInt('0x${value.split('#').pop()}'));
+        return new Color(switch value {
+            case "white": 0xFFFFFF;
+            case "silver": 0xC0C0C0;
+            case "gray": 0x808080;
+            case "black": 0x000000;
+            case "red": 0xFF0000;
+            case "maroon": 0x800000;
+            case "yellow": 0xFFFF00;
+            case "olive": 0x808000;
+            case "lime": 0x00FF00;
+            case "green": 0x008000;
+            case "aqua": 0x00FFFF;
+            case "teal": 0x008080;
+            case "blue": 0x0000FF;
+            case "navy": 0x000080;
+            case "fuchsia": 0xFF00FF;
+            case "purple": 0x800080;
+            case x: Std.parseInt('0x${x.split('#').pop()}');
+        });
     }
 
     @:to public inline function toString():String {
diff --git a/src/main/haxework/view/group/GroupView.hx b/src/main/haxework/view/group/GroupView.hx
index b536753..a5c95b9 100755
--- a/src/main/haxework/view/group/GroupView.hx
+++ b/src/main/haxework/view/group/GroupView.hx
@@ -79,6 +79,7 @@ class OverflowControl {
     private var _mask:Sprite;
     private var scrollX(get, null):HScrollBarView;
     private var scrollY(get, null):VScrollBarView;
+    private var maskEnable(default, set):Bool;
 
     public var overflowControlX(default, null):OverflowControl;
     public var overflowControlY(default, null):OverflowControl;
@@ -88,8 +89,6 @@ class OverflowControl {
         container = new Sprite();
         content.addChild(container);
         _mask = new Sprite();
-        content.addChild(_mask);
-        container.mask = _mask;
         this.layout = layout != null ? layout : new DefaultLayout();
         this.overflow = overflow != null ? overflow : new Overflow();
         views = [];
@@ -101,6 +100,21 @@ class OverflowControl {
         content.addEventListener(TouchEvent.TOUCH_BEGIN, onTouchBegin);
     }
 
+    private function set_maskEnable(value:Bool):Bool {
+        if (maskEnable != value) {
+            maskEnable = value;
+            if (maskEnable) {
+                content.addChild(_mask);
+                container.mask = _mask;
+            } else {
+                content.removeChild(_mask);
+                container.mask = null;
+            }
+
+        }
+        return value;
+    }
+
     private function onMouseWheelEvent(event:MouseEvent):Void {
         if (overflowY > 1) {
             #if flash event.preventDefault(); #end
@@ -157,10 +171,12 @@ class OverflowControl {
     }
 
     public function set_overflowX(value:Float):Float {
+        maskEnable = value > 1;
         return overflowX = overflowControlX.overflow = value;
     }
 
     public function set_overflowY(value:Float):Float {
+        maskEnable = value > 1;
         return overflowY = overflowControlY.overflow = value;
     }
 
@@ -177,7 +193,9 @@ class OverflowControl {
         overflowControlY.size = height;
         _mask.graphics.clear();
         _mask.graphics.beginFill(0, 1);
-        _mask.graphics.drawRect(0, 0, width, height);
+        if (!Math.isNaN(width) && !Math.isNaN(height) && width > 0 && height > 0) {
+            _mask.graphics.drawRect(0, 0, width, height);
+        }
         _mask.graphics.endFill();
     }