ES-975464 - Resolve the ReadMe issue in this sample repository

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,118 @@
-# How to convert event to command in MVVM pattern in wpf treeview?
-This repository describes how to convert event to command in MVVM pattern in wpf treeview
+# How to convert event to command in MVVM pattern in WPF TreeView
+
+This repository describes how to convert event to command in MVVM pattern in [WPF TreeView](https://www.syncfusion.com/wpf-controls/treeview) (SfTreeView).
+
+The `TreeView` event can be converted into commands using Behaviors. To achieve this, create a command in the `ViewModel` class and associate it to the `TreeView` event using Behaviors.
+
+#### XAML
+
+``` xml
+<syncfusion:SfTreeView 
+            x:Name="sfTreeView"
+            Margin="20"
+            BorderThickness="1"
+            SelectionMode="Multiple"
+            AutoExpandMode="AllNodes"
+            BorderBrush="LightGray"   
+            ChildPropertyName="Models"
+            ItemTemplateDataContextType="Node"
+            ItemsSource="{Binding Items}">
+    <syncfusion:SfTreeView.ItemTemplate>
+        <DataTemplate>
+            <Grid>
+                <TextBlock FontSize="12" VerticalAlignment="Center" Text="{Binding Content.State}" />
+            </Grid>
+        </DataTemplate>
+    </syncfusion:SfTreeView.ItemTemplate>
+    <I:Interaction.Triggers>
+        <I:EventTrigger EventName="SelectionChanged" >
+            <cmd:EventToCommand Command="{Binding SelectionChangedCommand}" PassEventArgsToCommand="True" />
+        </I:EventTrigger>
+    </I:Interaction.Triggers>
+</syncfusion:SfTreeView>
+```
+
+#### C#
+
+``` csharp
+public class ViewModel : NotificationObject
+{
+    public ObservableCollection<Model> Items { get; set; }
+
+    private ICommand selectionChangedCommand;
+
+    public ICommand SelectionChangedCommand
+    {
+        get
+        {
+            return selectionChangedCommand;
+        }
+        set
+        {
+            selectionChangedCommand = value;
+        }
+    }
+   
+    public ViewModel()
+    {
+        Items = new ObservableCollection<Model>();
+
+        SelectionChangedCommand = new BaseCommand(OnSelectionChanged);
+
+        var country1 = new Model { State = "Australia" };
+        var country2 = new Model { State = "Brazil" };
+        var country3 = new Model { State = "China" };
+        var country4 = new Model { State = "France" };            
+
+        var aus_state1 = new Model { State = "New South Wales" };
+        var aus_state2 = new Model { State = "Victoria" };
+        var aus_state3 = new Model { State = "South Autralia" };
+        var aus_state4 = new Model { State = "Western Australia" };
+
+        var brazil_state1 = new Model { State = "Parana" };
+        var brazil_state2 = new Model { State = "Ceara" };
+        var brazil_state3 = new Model { State = "Acre" };
+
+        var china_state1 = new Model { State = "Guangzhou" };
+        var china_state2 = new Model { State = "Shanghai" };
+        var china_state3 = new Model { State = "Beijing" };
+        var china_state4 = new Model { State = "Shantou" };
+
+        var france_state1 = new Model { State = "Pays de la Loire" };
+        var france_state2 = new Model { State = "Aquitaine" };
+        var france_state3 = new Model { State = "Brittany" };
+        var france_state4 = new Model { State = "Lorraine" };
+      
+        country1.Models.Add(aus_state1);
+        country1.Models.Add(aus_state2);
+        country1.Models.Add(aus_state3);
+        country1.Models.Add(aus_state4);
+
+        country2.Models.Add(brazil_state1);
+        country2.Models.Add(brazil_state2);
+        country2.Models.Add(brazil_state3);
+
+        country3.Models.Add(china_state1);
+        country3.Models.Add(china_state2);
+        country3.Models.Add(china_state3);
+        country3.Models.Add(china_state4);
+
+        country4.Models.Add(france_state1);
+        country4.Models.Add(france_state2);
+        country4.Models.Add(france_state3);
+        country4.Models.Add(france_state4);
+
+        Items.Add(country1);
+        Items.Add(country2);
+        Items.Add(country3);
+        Items.Add(country4);
+    }
+
+    private void OnSelectionChanged(object obj)
+    {
+        var args = obj as ItemSelectionChangedEventArgs;
+        if (args.AddedItems.Count > 0)
+            MessageBox.Show("Selected State: " + (args.AddedItems[0] as Model).State.ToString());
+    }
+}
+```