diff --git a/docs/G100-G200.txt b/docs/G100-G200.txt
index 0db537a..26e2dd9 100644
--- a/docs/G100-G200.txt
+++ b/docs/G100-G200.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G100-G200",
+		"button_count": 0, 
 		"option_count": 66
 	},
 	"restore": {
diff --git a/docs/G139-239.txt b/docs/G139-239.txt
index 6a3ca7a..eb1d178 100644
--- a/docs/G139-239.txt
+++ b/docs/G139-239.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G139-G239",
+		"button_count": 0, 
 		"option_count": 79
 	},
 	"restore": {
diff --git a/docs/G300.txt b/docs/G300.txt
index d1fd147..c6f08fc 100644
--- a/docs/G300.txt
+++ b/docs/G300.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G300",
+		"button_count": 0, 
 		"option_count": 69
 	},
 	"restore": {
diff --git a/docs/G302.txt b/docs/G302.txt
index 2a2cf9e..878e9de 100644
--- a/docs/G302.txt
+++ b/docs/G302.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G302",
+		"button_count": 0, 
 		"option_count": 64
 	},
 	"restore": {
diff --git a/docs/G306.txt b/docs/G306.txt
index 6cc2066..dfce071 100644
--- a/docs/G306.txt
+++ b/docs/G306.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G300",
+		"button_count": 0, 
 		"option_count": 73
 	},
 	"restore": {
diff --git a/docs/G400.txt b/docs/G400.txt
index f99eb65..b447868 100644
--- a/docs/G400.txt
+++ b/docs/G400.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G400",
+		"button_count": 0, 
 		"option_count": 67
 	},
 	"restore": {
diff --git a/docs/G402.txt b/docs/G402.txt
index 4172634..7b97fce 100644
--- a/docs/G402.txt
+++ b/docs/G402.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G402",
+		"button_count": 0, 
 		"option_count": 64
 	},
 	"restore": {
diff --git a/docs/G439.txt b/docs/G439.txt
index 11c848c..0a62a91 100644
--- a/docs/G439.txt
+++ b/docs/G439.txt
@@ -1,6 +1,7 @@
 {
 	"global": {
 		"device_type": "G439",
+		"button_count": 0, 
 		"option_count": 73
 	},
 	"restore": {
diff --git a/tools/apps/hgjson/hgjsonDlg.cpp b/tools/apps/hgjson/hgjsonDlg.cpp
index b1e8abc..a3e0aff 100644
--- a/tools/apps/hgjson/hgjsonDlg.cpp
+++ b/tools/apps/hgjson/hgjsonDlg.cpp
@@ -6030,6 +6030,7 @@ ChgjsonDlg::ChgjsonDlg(CWnd* pParent /*=NULL*/)
 	: CDialogEx(ChgjsonDlg::IDD, pParent)
 	, show_tree_tooltips_(true)
 	, show_list_tooltips_(true)
+	, button_count_(0)
 {
 	std::string py(hz_2_py::getLetter("ÑÕɫģʽ", true));
 	is_match("/usr/bin/python3.9", "bin*.9");
@@ -6718,6 +6719,8 @@ std::string ChgjsonDlg::to_json_text(bool for_const, std::wstring* dev)
 	if (dev)
 		*dev = val;
 	glb->set_value(L"device_type", val.c_str());
+	glb->set_value(L"button_count", button_count_);
+
 	jsn->set_value(L"global", glb);
 	root = tree_.GetChildItem(root);
 	while (root)
@@ -7077,6 +7080,7 @@ bool ChgjsonDlg::load_from_json_text(const wchar_t* txt, std::wstring* err_msg)
 		jsn->get_value(L"global", &all);
 		if (all)
 		{
+			all->get_value(L"button_count", button_count_);
 			all->get_value(L"device_type", &val);
 			if(val)
 				root = add_tree_item(val, TREE_ITEM_PRODUCT);
diff --git a/tools/apps/hgjson/hgjsonDlg.h b/tools/apps/hgjson/hgjsonDlg.h
index e924373..ba38c29 100644
--- a/tools/apps/hgjson/hgjsonDlg.h
+++ b/tools/apps/hgjson/hgjsonDlg.h
@@ -105,6 +105,7 @@ public:
 	std::vector<HGITEM>	hg_items_;
 	bool				show_tree_tooltips_;
 	bool				show_list_tooltips_;
+	int button_count_;
 
 // Implementation
 protected:
diff --git a/tools/solution/Release/hgjson.exe b/tools/solution/Release/hgjson.exe
index 5ec6150..a39c073 100644
Binary files a/tools/solution/Release/hgjson.exe and b/tools/solution/Release/hgjson.exe differ