ES-975464 - Resolve Issues ReadMe length issue in this repository

Author: SreemonPremkumarM

README.md

@@ -1,3 +1,20 @@
 # how-to-bind-view-model-ItemsSource-to-combo-box-inside-template-in-wpf-and-uwp-treegrid-in-mvvm
 
-This example illustrates to bind the ComBox ItemsSource that is loaded inside the template column.
+This example illustrates to bind the ComboBox `ItemsSource` that is loaded inside the template column.
+
+You can load a ComboBox inside [TreeGridTemplateColumn](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridTemplateColumn.html) and bind the `ItemsSource` from ViewModel to ComboBox using `ElementName` binding.
+
+```xml
+<syncfusion:TreeGridTemplateColumn MappingName="Title" syncfusion:FocusManagerHelper.WantsKeyInput="True">
+         <syncfusion:TreeGridTemplateColumn.CellTemplate>
+            <DataTemplate>
+                    <TextBlock Text="{Binding Title}"/>
+            </DataTemplate>
+         </syncfusion:TreeGridTemplateColumn.CellTemplate>
+         <syncfusion:TreeGridTemplateColumn.EditTemplate>
+         <DataTemplate>
+                    <ComboBox ItemsSource="{Binding Path=DataContext.TitleList, ElementName=treeGrid}" />
+        </DataTemplate>
+        </syncfusion:TreeGridTemplateColumn.EditTemplate>
+ </syncfusion:TreeGridTemplateColumn>
+```