diff --git a/include/nana/gui/programming_interface.hpp b/include/nana/gui/programming_interface.hpp
index 9ee2e7c07..3ce6e4d7a 100644
--- a/include/nana/gui/programming_interface.hpp
+++ b/include/nana/gui/programming_interface.hpp
@@ -1,7 +1,7 @@
 /*
  *	Nana GUI Programming Interface Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2023 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2024 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -133,7 +133,10 @@ namespace api
 
 		std::optional<upoint> caret_position(window);
 
-		upoint im_input(window, const upoint& insert_pos, const std::wstring&, bool candidate);
+		upoint	im_input(window, const upoint& insert_pos, const std::wstring&, bool candidate);
+
+		/// Cancel the candidate mode
+		void	im_cancel(window);
 	}//end namespace dev
 
 
@@ -515,6 +518,8 @@ namespace api
 	std::size_t window_dpi(window);
 	dragdrop_status window_dragdrop_status(::nana::window);
 
+	void keyboard_default_language(const std::string& lang);
+
 	/// Configures the qwerty keyboard for a text editor
 	/**
 	 * @param wd The handle to a text editor window. Such as textbox and combox.
@@ -527,7 +532,7 @@ namespace api
 
 	/// Configures the numeric keyboard. It returns true if virtual keyboard is enabled and
 	/// the specified window is a text editor window, false otherwise.
-	bool keyboard_numeric(window);
+	bool keyboard_numeric(window, bool padding);
 }//end namespace api
 
 namespace API = api;
diff --git a/source/gui/programming_interface.cpp b/source/gui/programming_interface.cpp
index 1a7d0d4c0..b918a6142 100644
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -1,7 +1,7 @@
 /*
  *	Nana GUI Programming Interface Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2023 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2024 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -460,11 +460,21 @@ namespace api
 		{
 			internal_scope_guard lock;
 			if (is_window(wd) && wd->annex.text_editor)
-
 				return wd->annex.text_editor->im_input(insert_pos, str, candidate);
 			return {};
 		}
 
+		/// Cancels the candiate mode
+		/**
+		* Cancels the candidate mode when the virtual keyboard window is closed.
+		*/
+		void im_cancel(window wd)
+		{
+			internal_scope_guard lock;
+			if (is_window(wd) && wd->annex.text_editor)
+				wd->annex.text_editor->im_cancel();
+		}
+
 
 	}//end namespace dev
 
@@ -1707,6 +1717,12 @@ namespace api
 		return dragdrop_status::not_ready;
 	}
 
+	void keyboard_default_language(const std::string& lang)
+	{
+		internal_scope_guard lock;
+		restrict::bedrock.vkeyboard().default_im_value() = lang;
+	}
+
 	/// Configures the qwerty keyboard for a text editor
 	bool keyboard_qwerty(window wd, std::vector<std::string> langs, keyboard_behaves behave, keyboard_modes mode)
 	{
@@ -1723,11 +1739,11 @@ namespace api
 	}
 
 	/// Configures the numeric keyboard.
-	bool keyboard_numeric(window wd)
+	bool keyboard_numeric(window wd, bool padding)
 	{
 		internal_scope_guard lock;
 #ifdef NANA_ENABLE_VIRTUAL_KEYBOARD
-		return restrict::bedrock.vkeyboard().numeric(wd);
+		return restrict::bedrock.vkeyboard().numeric(wd, padding);
 #else
 		(void)wd;
 		return false;
diff --git a/source/gui/widgets/menu.cpp b/source/gui/widgets/menu.cpp
index ffd2eccea..cfa9f741e 100644
--- a/source/gui/widgets/menu.cpp
+++ b/source/gui/widgets/menu.cpp
@@ -92,8 +92,8 @@ namespace nana
 				sz.width -= left_width;
 				sz.height -= 2;
 				graph.rectangle(false, colors::gray_border);
-				graph.rectangle({ 1, 1, left_width - 2, sz.height }, true, static_cast<color_rgb>(0xf6f6f6));
-				graph.rectangle({ static_cast<int>(left_width - 1), 1, sz.width, sz.height }, true, colors::white);
+				graph.rectangle({ 1, 1, left_width - unit, sz.height }, true, static_cast<color_rgb>(0xf6f6f6));
+				graph.rectangle({ static_cast<int>(left_width - unit), 1, sz.width, sz.height }, true, colors::white);
 			}
 
 			void item(graph_reference graph, const nana::rectangle& r, const attr& at) override
diff --git a/source/paint/pixel_buffer.cpp b/source/paint/pixel_buffer.cpp
index ebcdbee2a..574aee5d9 100644
--- a/source/paint/pixel_buffer.cpp
+++ b/source/paint/pixel_buffer.cpp
@@ -984,7 +984,7 @@ namespace nana{	namespace paint
 	void pixel_buffer::rectangle(const nana::rectangle &r, const ::nana::color& clr, double fade_rate, bool solid)
 	{
 		auto sp = storage_.get();
-		if((nullptr == sp) || (fade_rate == 1.0)) return;
+		if((nullptr == sp) || (fade_rate == 1.0) || r.empty()) return;
 
 		if (r.right() < 0 || r.x >= static_cast<int>(sp->pixel_size.width) || r.bottom() < 0 || r.y >= static_cast<int>(sp->pixel_size.height))
 			return;