diff --git a/examples/example1/src/main.d b/examples/example1/src/main.d
index 39512412..ba43def4 100644
--- a/examples/example1/src/main.d
+++ b/examples/example1/src/main.d
@@ -1,4 +1,4 @@
-module winmain;
+module main;
 
 import dlangui.all;
 import std.stdio;
@@ -24,13 +24,6 @@ extern (C) int UIAppMain(string[] args) {
     // select translation file - for english language
     i18n.load("en.ini"); //"ru.ini", "en.ini"
 
-
-    DrawBufRef img = imageCache.get("C:\\projects\\d\\dlangui\\res\\mdpi\\btn_radio_on_holo_light.png");
-    ColorDrawBuf buf = cast(ColorDrawBuf)img.get;
-    //GrayDrawBuf gbuf = cast(GrayDrawBuf)img.get;
-    uint * row = buf.scanLine(0);
-    Log.d("btn_radio_on_holo_light pixels: ", row[0], row[1], row[2]);
-
     // create window
     Window window = Platform.instance.createWindow("My Window", null);
 	
diff --git a/res/btn_default_small.xml b/res/btn_default_small.xml
index 358969f7..5485ea03 100644
--- a/res/btn_default_small.xml
+++ b/res/btn_default_small.xml
@@ -1,25 +1,33 @@
-<?xml version="1.0" encoding="utf-8"?>
-<selector xmlns:android="http://schemas.android.com/apk/res/android"
-  android:constantSize="true"
-  android:dither="false"
-  android:variablePadding="false" >
-  <item
-    android:drawable="btn_default_small_normal_disable_focused"
-    android:state_enabled="false" />
-    android:state_focused="true" />
-  <item
-    android:drawable="btn_default_small_normal_disable"
-    android:state_focused="true" />
-  <item
-    android:drawable="btn_default_small_pressed"
-    android:state_pressed="true" />
-  <item
-    android:drawable="btn_default_small_selected"
-    android:state_selected="true" />
-  <item
-    android:drawable="btn_default_small_normal_hover"
-    android:state_hovered="true" />
-  <item
-    android:drawable="btn_default_small_normal" 
-   />
-</selector>
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2008 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_window_focused="false" android:state_enabled="true"
+        android:drawable="@drawable/btn_default_small_normal" />
+    <item android:state_window_focused="false" android:state_enabled="false"
+        android:drawable="@drawable/btn_default_small_normal_disable" />
+    <item android:state_pressed="true" 
+        android:drawable="@drawable/btn_default_small_pressed" />
+    <item android:state_focused="true" android:state_enabled="true"
+        android:drawable="@drawable/btn_default_small_selected" />
+    <item android:state_enabled="true"
+        android:drawable="@drawable/btn_default_small_normal" />
+    <item android:state_focused="true"
+        android:drawable="@drawable/btn_default_small_normal_disable_focused" />
+    <item
+         android:drawable="@drawable/btn_default_small_normal_disable" />
+</selector>
+
diff --git a/res/mdpi/btn_default_small_normal.9.png b/res/mdpi/btn_default_small_normal.9.png
new file mode 100644
index 00000000..5dddd464
Binary files /dev/null and b/res/mdpi/btn_default_small_normal.9.png differ
diff --git a/res/mdpi/btn_default_small_normal_disable.9.png b/res/mdpi/btn_default_small_normal_disable.9.png
new file mode 100644
index 00000000..6ab5c4a2
Binary files /dev/null and b/res/mdpi/btn_default_small_normal_disable.9.png differ
diff --git a/res/mdpi/btn_default_small_normal_disable_focused.9.png b/res/mdpi/btn_default_small_normal_disable_focused.9.png
new file mode 100644
index 00000000..c65bace3
Binary files /dev/null and b/res/mdpi/btn_default_small_normal_disable_focused.9.png differ
diff --git a/res/mdpi/btn_default_small_pressed.9.png b/res/mdpi/btn_default_small_pressed.9.png
new file mode 100644
index 00000000..43e82f97
Binary files /dev/null and b/res/mdpi/btn_default_small_pressed.9.png differ
diff --git a/res/mdpi/btn_default_small_selected.9.png b/res/mdpi/btn_default_small_selected.9.png
new file mode 100644
index 00000000..7a376a97
Binary files /dev/null and b/res/mdpi/btn_default_small_selected.9.png differ
diff --git a/src/dlangui/widgets/controls.d b/src/dlangui/widgets/controls.d
index e0b97828..51bbee49 100644
--- a/src/dlangui/widgets/controls.d
+++ b/src/dlangui/widgets/controls.d
@@ -261,9 +261,26 @@ class RadioButton : ImageTextButton {
         styleId = "TRANSPARENT_BUTTON_BACKGROUND";
         checkable = true;
     }
+
+	void uncheckSiblings() {
+		Widget p = parent;
+		if (!p)
+			return;
+		for (int i = 0; i < p.childCount; i++) {
+			Widget child = p.child(i);
+			if (child is this)
+				continue;
+			RadioButton rb = cast(RadioButton)child;
+			if (rb)
+				rb.checked = false;
+		}
+	}
+
     // called to process click and notify listeners
     override protected bool handleClick() {
+		uncheckSiblings();
         checked = true;
+
         return super.handleClick();
     }
 
@@ -279,6 +296,7 @@ class Button : Widget {
     this(string ID = null) {
 		super(ID);
         styleId = "BUTTON";
+		clickable = true;
         focusable = true;
         trackHover = true;
     }
@@ -399,6 +417,7 @@ class ScrollBar : AbstractSlider, OnClickHandler {
             super(ID);
             styleId = "PAGE_SCROLL";
             trackHover = true;
+            clickable = true;
         }
     }
 
diff --git a/src/dlangui/widgets/lists.d b/src/dlangui/widgets/lists.d
index ce8be428..66cf932e 100644
--- a/src/dlangui/widgets/lists.d
+++ b/src/dlangui/widgets/lists.d
@@ -236,7 +236,7 @@ class ListWidget : WidgetGroup, OnScrollHandler {
     }
 
     /// override to handle focus changes
-    override protected void onFocusChange(bool focused) {
+    override protected void handleFocusChange(bool focused) {
         updateSelectedItemFocus();
     }
 
diff --git a/src/dlangui/widgets/menu.d b/src/dlangui/widgets/menu.d
index abfd671c..99431e57 100644
--- a/src/dlangui/widgets/menu.d
+++ b/src/dlangui/widgets/menu.d
@@ -90,6 +90,7 @@ class MenuItemWidget : HorizontalLayout {
         _label.text = _item.label;
         addChild(_label);
         trackHover = true;
+		clickable = true;
     }
 }
 
diff --git a/src/dlangui/widgets/tabs.d b/src/dlangui/widgets/tabs.d
index f5509454..79c6e2e3 100644
--- a/src/dlangui/widgets/tabs.d
+++ b/src/dlangui/widgets/tabs.d
@@ -20,6 +20,7 @@ Authors:   $(WEB coolreader.org, Vadim Lopatin)
 */
 module dlangui.widgets.tabs;
 
+import dlangui.core.signals;
 import dlangui.widgets.layouts;
 import dlangui.widgets.controls;
 
@@ -82,6 +83,7 @@ class TabItemWidget : HorizontalLayout {
         addChild(_label);
         addChild(_closeButton);
         setItem(item);
+		clickable = true;
         trackHover = true;
     }
     protected bool onClick(Widget source) {
diff --git a/src/dlangui/widgets/widget.d b/src/dlangui/widgets/widget.d
index c0635dfc..7b297b41 100644
--- a/src/dlangui/widgets/widget.d
+++ b/src/dlangui/widgets/widget.d
@@ -52,10 +52,21 @@ enum Orientation : ubyte {
     Horizontal
 }
 
+/// interface - slot for onClick
 interface OnClickHandler {
     bool onClick(Widget source);
 }
 
+/// interface - slot for onCheckChanged
+interface OnCheckHandler {
+    bool onCheckChanged(Widget source, bool checked);
+}
+
+/// interface - slot for onFocusChanged
+interface OnFocusHandler {
+    bool onFocusChanged(Widget source, bool focused);
+}
+
 class Widget {
     /// widget id
     protected string _id;
@@ -152,10 +163,15 @@ class Widget {
     @property uint state() const {
         if ((_state & State.Parent) != 0 && _parent !is null)
             return _parent.state;
-        return _state;
+        return _state | State.WindowFocused; // TODO:
     }
     /// override to handle focus changes
-    protected void onFocusChange(bool focused) {
+    protected void handleFocusChange(bool focused) {
+		onFocusChangeListener(this, checked);
+    }
+    /// override to handle check changes
+    protected void handleCheckChange(bool checked) {
+		onCheckChangeListener(this, checked);
     }
     /// set new widget state (set of flags from State enum)
     @property Widget state(uint newState) {
@@ -166,9 +182,14 @@ class Widget {
             invalidate();
             // notify focus changes
             if ((oldState & State.Focused) && !(newState & State.Focused))
-                onFocusChange(false);
+                handleFocusChange(false);
             else if (!(oldState & State.Focused) && (newState & State.Focused))
-                onFocusChange(true);
+                handleFocusChange(true);
+            // notify checked changes
+            if ((oldState & State.Checked) && !(newState & State.Checked))
+                handleCheckChange(false);
+            else if (!(oldState & State.Checked) && (newState & State.Checked))
+                handleCheckChange(true);
         }
         return this;
     }
@@ -337,13 +358,23 @@ class Widget {
         return _pos.isPointInside(x, y);
     }
 
+	/// return true if state has State.Enabled flag set
+    @property bool enabled() { return (state & State.Enabled) != 0; }
+	/// change enabled state
+    @property Widget enabled(bool flg) { flg ? setState(State.Enabled) : resetState(State.Enabled); return this; }
+
     protected bool _clickable;
+	/// when true, user can click this control, and get onClick listeners called
     @property bool clickable() { return _clickable; }
     @property Widget clickable(bool flg) { _clickable = flg; return this; }
+    @property bool canClick() { return _clickable && enabled && visible; }
 
     protected bool _checkable;
+	/// when true, control supports Checked state
     @property bool checkable() { return _checkable; }
     @property Widget checkable(bool flg) { _checkable = flg; return this; }
+    @property bool canCheck() { return _checkable && enabled && visible; }
+
 
     protected bool _checked;
     /// get checked state
@@ -425,7 +456,7 @@ class Widget {
 
     /// process key event, return true if event is processed.
     bool onKeyEvent(KeyEvent event) {
-		if (clickable) {
+		if (canClick) {
             // support onClick event initiated by Space or Return keys
             if (event.action == KeyAction.KeyDown) {
                 if (event.keyCode == KeyCode.SPACE || event.keyCode == KeyCode.RETURN) {
@@ -448,7 +479,7 @@ class Widget {
     bool onMouseEvent(MouseEvent event) {
         //Log.d("onMouseEvent ", id, " ", event.action, "  (", event.x, ",", event.y, ")");
 		// support onClick
-		if (clickable) {
+		if (canClick) {
 	        if (event.action == MouseAction.ButtonDown && event.button == MouseButton.Left) {
 	            setState(State.Pressed);
                 if (focusable)
@@ -497,10 +528,16 @@ class Widget {
 	    return false;
     }
 
+    // =======================================================
+    // Signals
 
 	/// on click event listener (bool delegate(Widget))
     Signal!OnClickHandler onClickListener;
-	
+	/// checked state change event listener (bool delegate(Widget, bool))
+    Signal!OnCheckHandler onCheckChangeListener;
+	/// focus state change event listener (bool delegate(Widget, bool))
+    Signal!OnFocusHandler onFocusChangeListener;
+
     // =======================================================
     // Layout and measurement methods