diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
index 3cb699c..7899c91 100644
--- a/demo/CMakeLists.txt
+++ b/demo/CMakeLists.txt
@@ -71,7 +71,7 @@ if (Qt5Charts_FOUND)
 endif()
 
 set(Demo_SRCS src/main.cpp src/Fibonacci.cpp src/Tree.cpp  src/TimeSeries.cpp
-    src/Processes.cpp resource_file.qrc)
+    src/Processes.cpp src/SortedModel.cpp resource_file.qrc)
 
 add_executable(Demo ${Demo_SRCS})
 add_dependencies(Demo rust_target)
diff --git a/demo/demo.qml b/demo/demo.qml
index eadfcef..c734a7d 100644
--- a/demo/demo.qml
+++ b/demo/demo.qml
@@ -93,46 +93,65 @@ ApplicationWindow {
                     var first = sortedFileSystem.index(0, 0, root);
                     treeView.expand(first);
                 }
+                onSortIndicatorColumnChanged: sort()
+                onSortIndicatorOrderChanged: sort()
+                function sort() {
+                    var role = getColumn(treeView.sortIndicatorColumn).role;
+                    model.sortByRole(role, treeView.sortIndicatorOrder);
+                }
             }
         }
         Tab {
             title: "processes"
-            TreeView {
-                id: processView
-                model: processes
-                sortIndicatorVisible: true
-                alternatingRowColors: true
-                TableViewColumn {
-                    title: "pid"
-                    role: "pid"
-                }
-                TableViewColumn {
-                    title: "name"
-                    role: "name"
-                }
-                TableViewColumn {
-                    title: "cpu"
-                    role: "cpu"
-                }
-                onSortIndicatorColumnChanged: {
-                    switch (processView.sortIndicatorColumn) {
-                    case 0: model.sortRole = Qt.DisplayRole; break;
+            Item {
+                anchors.fill: parent
+                TextField {
+                    id: processFilterInput
+                    width: parent.width
+                    placeholderText: "Filter processes"
+                    onTextChanged: {
+                        processes.filterRegExp
+                            = new RegExp(processFilterInput.text);
                     }
                 }
-                onSortIndicatorOrderChanged: {
-                    model.sort(Qt.DisplayRole, processView.sortIndicatorOrderChanged);
-                }
-                Component.onCompleted: {
-                    var r = processView.rootIndex;
-                    var a = processes.index(0, 0, r);
-                    var b = processes.index(1, 0, r);
-                    processView.expand(processView.rootIndex);
-                    processView.expand(a);
-                    processView.expand(b);
-                    processes.rowsInserted.connect(function (index) {
+                TreeView {
+                    width: parent.width
+                    anchors.top: processFilterInput.bottom
+                    anchors.bottom: parent.bottom
+                    id: processView
+                    model: processes
+                    sortIndicatorVisible: true
+                    alternatingRowColors: true
+                    TableViewColumn {
+                        title: "pid"
+                        role: "pid"
+                    }
+                    TableViewColumn {
+                        title: "name"
+                        role: "name"
+                    }
+                    TableViewColumn {
+                        title: "cpu"
+                        role: "cpu"
+                    }
+                    onSortIndicatorColumnChanged: sort()
+                    onSortIndicatorOrderChanged: sort()
+                    function sort() {
+                        var role = getColumn(processView.sortIndicatorColumn).role;
+                        model.sortByRole(role, processView.sortIndicatorOrder);
+                    }
+                    Component.onCompleted: {
+                        var r = processView.rootIndex;
+                        var a = processes.index(0, 0, r);
+                        var b = processes.index(1, 0, r);
                         processView.expand(processView.rootIndex);
-                        processView.expand(index);
-                    });
+                        processView.expand(a);
+                        processView.expand(b);
+                        processes.rowsInserted.connect(function (index) {
+                            processView.expand(processView.rootIndex);
+                            processView.expand(index);
+                        });
+                    }
                 }
             }
 /*
diff --git a/demo/src/SortedModel.cpp b/demo/src/SortedModel.cpp
new file mode 100644
index 0000000..6d51da9
--- /dev/null
+++ b/demo/src/SortedModel.cpp
@@ -0,0 +1 @@
+#include "SortedModel.moc"
diff --git a/demo/src/SortedModel.h b/demo/src/SortedModel.h
new file mode 100644
index 0000000..5157aa0
--- /dev/null
+++ b/demo/src/SortedModel.h
@@ -0,0 +1,24 @@
+#ifndef SORTED_MODEL
+#define SORTED_MODEL
+
+#include <QSortFilterProxyModel>
+#include <QDebug>
+
+class SortedModel : public QSortFilterProxyModel {
+Q_OBJECT
+public:
+    SortedModel() :QSortFilterProxyModel() {}
+public slots:
+    void sortByRole(const QString& role, Qt::SortOrder order) {
+        QHashIterator<int, QByteArray> i(roleNames());
+        while (i.hasNext()) {
+            i.next();
+            if (i.value() == role) {
+                setSortRole(i.key());
+            }
+        }
+        sort(0, order);
+    }
+};
+
+#endif
diff --git a/demo/src/main.cpp b/demo/src/main.cpp
index c280adf..4cc9d16 100644
--- a/demo/src/main.cpp
+++ b/demo/src/main.cpp
@@ -2,6 +2,7 @@
 #include "Fibonacci.h"
 #include "TimeSeries.h"
 #include "Processes.h"
+#include "SortedModel.h"
 
 #ifdef QT_CHARTS_LIB
 #include <QtCharts>
@@ -43,9 +44,9 @@ struct Models {
     Fibonacci fibonacci;
     FibonacciList fibonacciList;
     Tree fileSystem;
-    QSortFilterProxyModel sortedFileSystem;
+    SortedModel sortedFileSystem;
     Processes processes;
-    QSortFilterProxyModel sortedProcesses;
+    SortedModel sortedProcesses;
     TimeSeries timeSeries;
 };