diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index f3257c296..9264b433b 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -2023,10 +2023,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
 
 
-    def show_qrcode(self, data, title = _("QR code")):
+    def show_qrcode(self, data, title = _("QR code"), parent=None):
         if not data:
             return
-        d = QRDialog(data, self, title)
+        d = QRDialog(data, parent or self, title)
         d.exec_()
 
     def show_public_keys(self, address):
diff --git a/gui/qt/qrcodewidget.py b/gui/qt/qrcodewidget.py
index ab1008de4..51a028470 100644
--- a/gui/qt/qrcodewidget.py
+++ b/gui/qt/qrcodewidget.py
@@ -1,6 +1,5 @@
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
-import PyQt4.QtCore as QtCore
 import PyQt4.QtGui as QtGui
 
 import os
@@ -9,6 +8,7 @@ import qrcode
 import electrum
 from electrum import bmp
 from electrum.i18n import _
+from util import WindowModalDialog, MessageBoxMixin
 
 
 class QRCodeWidget(QWidget):
@@ -83,13 +83,11 @@ class QRCodeWidget(QWidget):
 
 
 
-class QRDialog(QDialog):
+class QRDialog(WindowModalDialog, MessageBoxMixin):
 
     def __init__(self, data, parent=None, title = "", show_text=False):
-        QDialog.__init__(self, parent)
+        WindowModalDialog.__init__(self, parent, title)
 
-        d = self
-        d.setWindowTitle(title)
         vbox = QVBoxLayout()
         qrw = QRCodeWidget(data)
         vbox.addWidget(qrw, 1)
@@ -107,12 +105,12 @@ class QRDialog(QDialog):
 
             def print_qr():
                 bmp.save_qrcode(qrw.qr, filename)
-                QMessageBox.information(None, _('Message'), _("QR code saved to file") + " " + filename, _('OK'))
+                self.show_message(_("QR code saved to file") + " " + filename)
 
             def copy_to_clipboard():
                 bmp.save_qrcode(qrw.qr, filename)
                 QApplication.clipboard().setImage(QImage(filename))
-                QMessageBox.information(None, _('Message'), _("QR code saved to clipboard"), _('OK'))
+                self.show_message(_("QR code copied to clipboard"))
 
             b = QPushButton(_("Copy"))
             hbox.addWidget(b)
@@ -124,8 +122,8 @@ class QRDialog(QDialog):
 
         b = QPushButton(_("Close"))
         hbox.addWidget(b)
-        b.clicked.connect(d.accept)
+        b.clicked.connect(self.accept)
         b.setDefault(True)
 
         vbox.addLayout(hbox)
-        d.setLayout(vbox)
+        self.setLayout(vbox)
diff --git a/gui/qt/transaction_dialog.py b/gui/qt/transaction_dialog.py
index 180ed2c6c..a49dc1e8f 100644
--- a/gui/qt/transaction_dialog.py
+++ b/gui/qt/transaction_dialog.py
@@ -62,7 +62,7 @@ class TxDialog(QDialog, MessageBoxMixin):
 
         vbox.addWidget(QLabel(_("Transaction ID:")))
         self.tx_hash_e  = ButtonsLineEdit()
-        qr_show = lambda: self.parent.show_qrcode(str(self.tx_hash_e.text()), 'Transaction ID')
+        qr_show = lambda: self.parent.show_qrcode(str(self.tx_hash_e.text()), 'Transaction ID', parent=self)
         self.tx_hash_e.addButton(":icons/qrcode.png", qr_show, _("Show as QR code"))
         self.tx_hash_e.setReadOnly(True)
         vbox.addWidget(self.tx_hash_e)
@@ -132,7 +132,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         text = self.tx.raw.decode('hex')
         text = base_encode(text, base=43)
         try:
-            self.parent.show_qrcode(text, 'Transaction')
+            self.parent.show_qrcode(text, 'Transaction', parent=self)
         except Exception as e:
             self.show_message(str(e))