diff --git a/DSView/pv/data/decode/row.cpp b/DSView/pv/data/decode/row.cpp
index 13f24191..b54b402d 100644
--- a/DSView/pv/data/decode/row.cpp
+++ b/DSView/pv/data/decode/row.cpp
@@ -49,11 +49,12 @@ Row::Row(const Row &o)
 	_order = o._order;
 }
 
-bool Row::operator=(const Row &o)
+Row& Row::operator=(const Row &o)
 {
 	_decoder = o._decoder;
 	_row = o._row;
 	_order = o._order;
+	return (*this);
 }
 
 QString Row::title() const
diff --git a/DSView/pv/data/decode/row.h b/DSView/pv/data/decode/row.h
index ce236908..81c1e5cd 100644
--- a/DSView/pv/data/decode/row.h
+++ b/DSView/pv/data/decode/row.h
@@ -45,7 +45,7 @@ public:
 
 	Row(const Row &o);
 
-	bool operator=(const Row &o);
+	Row& operator=(const Row &o);
 
 public: 
 
diff --git a/DSView/pv/dialogs/protocolexp.cpp b/DSView/pv/dialogs/protocolexp.cpp
index 80a9e784..3cbac70b 100644
--- a/DSView/pv/dialogs/protocolexp.cpp
+++ b/DSView/pv/dialogs/protocolexp.cpp
@@ -77,7 +77,7 @@ ProtocolExp::ProtocolExp(QWidget *parent, SigSession *session) :
         for (auto i = rows.begin();i != rows.end(); i++) {
             if ((*i).second) {
                 QLabel *row_label = new QLabel((*i).first.title(), this);
-                QRadioButton *row_sel = new QRadioButton(this);
+                QCheckBox *row_sel = new QCheckBox(this);
                 if (row_index == 0) {
                     row_sel->setChecked(true);
                 }
@@ -193,7 +193,7 @@ void ProtocolExp::save_proc()
 
     QString title;
     int index = 0;
-    for (std::list<QRadioButton *>::const_iterator i = _row_sel_list.begin();
+    for (std::list<QCheckBox *>::const_iterator i = _row_sel_list.begin();
          i != _row_sel_list.end(); i++)
     {
         if ((*i)->isChecked())
diff --git a/DSView/pv/dialogs/protocolexp.h b/DSView/pv/dialogs/protocolexp.h
index 781c2add..ee53ec31 100644
--- a/DSView/pv/dialogs/protocolexp.h
+++ b/DSView/pv/dialogs/protocolexp.h
@@ -27,7 +27,7 @@
 #include <QFormLayout>
 #include <QVBoxLayout>
 #include <QLabel>
-#include <QRadioButton> 
+#include <QCheckBox> 
 #include <QString>
  
 #include "../prop/binding/deviceoptions.h"
@@ -70,7 +70,7 @@ private:
 
     toolbars::TitleBar *_titlebar;
     DsComboBox *_format_combobox;
-    std::list<QRadioButton *> _row_sel_list;
+    std::list<QCheckBox *> _row_sel_list;
     std::list<QLabel *> _row_label_list;
     QFormLayout *_flayout;
     QVBoxLayout *_layout;