diff --git a/core/core.vcxproj b/core/core.vcxproj
index 20976cb..2996153 100644
--- a/core/core.vcxproj
+++ b/core/core.vcxproj
@@ -22,7 +22,7 @@
     <ProjectGuid>{8C80C76D-F437-4C69-BC94-252AC44171C2}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
     <RootNamespace>core</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0.14393.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
diff --git a/core/src/wnd.cpp b/core/src/wnd.cpp
index 04045de..2deb55d 100644
--- a/core/src/wnd.cpp
+++ b/core/src/wnd.cpp
@@ -166,16 +166,8 @@ int c_wnd::load_clone_child_wnd(WND_TREE *p_child_tree)
 	WND_TREE* p_cur = p_child_tree;
 	while(p_cur->p_wnd)
 	{
-		if (0 != p_cur->p_wnd->m_resource_id)
-		{//This wnd has been used! Do not share!
-			ASSERT(FALSE);
-			return -1;
-		}
-		else
-		{
-			p_cur->p_wnd->connect_clone(this, p_cur->resource_id, p_cur->caption_id,
-				p_cur->x, p_cur->y, p_cur->width, p_cur->height,p_cur->p_child_tree);
-		}
+		p_cur->p_wnd->connect_clone(this, p_cur->resource_id, p_cur->caption_id,
+									p_cur->x, p_cur->y, p_cur->width, p_cur->height,p_cur->p_child_tree);
 		p_cur++;
 		sum++;
 	}
diff --git a/doc/HowToBuild.md b/doc/HowToBuild.md
index dd4fbab..0fd396c 100644
--- a/doc/HowToBuild.md
+++ b/doc/HowToBuild.md
@@ -22,8 +22,10 @@ For example: arm-linux-gnueabi-gcc
 - Output here: /GuiLite/libcore.a libgui.a
 
 ## How to build core&gui libary for Android?
+### Install cross compiler:
+`sudo apt-get install gcc-arm-linux-androideabi` 
+
 - `cd GuiLite`
-- `sudo apt-get install gcc-arm-linux-androideabi` skip this if you have got the tool
 - `cmake -D CMAKE_C_COMPILER="/usr/bin/arm-linux-androideabi-gcc" -D CMAKE_CXX_COMPILER="/usr/bin/arm-linux-androideabi-g++" .`
 - `make`
 - Output here: /GuiLite/libcore.a libgui.a
diff --git a/doc/qq.group.jpg b/doc/qq.group.jpg
index 95d2bf7..31f0e23 100644
Binary files a/doc/qq.group.jpg and b/doc/qq.group.jpg differ
diff --git a/gui/gui.vcxproj b/gui/gui.vcxproj
index a1218fd..2c10453 100644
--- a/gui/gui.vcxproj
+++ b/gui/gui.vcxproj
@@ -22,7 +22,7 @@
     <ProjectGuid>{89DB54E6-EFE1-4722-BD31-27FEBE39DFC6}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
     <RootNamespace>gui</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0.14393.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">