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Add the Limitation for the Checkbox Recursive Mode #2243

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Add the Limitation for the Checkbox Recursive Mode #2243

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2 changes: 2 additions & 0 deletions wpf/TreeView/Checkbox.md
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Expand Up @@ -251,6 +251,8 @@ sfTreeView.CheckedItems.Add(viewModel.Items[3]);
{% endhighlight %}
{% endtabs %}

N> Set [NodePopulationMode](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_NodePopulationMode) as `Instant` when programmatically adding items to the [CheckedItems](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_CheckedItems) to enable the `Recursive` checkbox mode.

## Events

### NodeChecked event
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6 changes: 6 additions & 0 deletions wpf/TreeView/Data-Population.md
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Expand Up @@ -25,11 +25,17 @@ To update the collection changes in UI, it is necessary to define [NotificationS
* None - It is a default mode and it doesn’t reflect collection/property changes in UI.
To decide how to populate the nodes, it is necessary to set this `NodePopulationMode` API to Treeview.

### NodePopulationMode

The [NodePopulationMode](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_NodePopulationMode) API has following enum values:

* OnDemand - Populate the child nodes only when parent nodes is expanded. It is the default value.
* Instant - Populates all the child nodes when Treeview control is initially loaded.

### Limitations when CheckBoxMode is Recursive

When [CheckBoxMode](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_CheckBoxMode) is set to `Recursive` and [NodePopulationMode](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_NodePopulationMode) is set to `OnDemand` (default), programmatically adding items to the [CheckedItems](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.SfTreeView.html#Syncfusion_UI_Xaml_TreeView_SfTreeView_CheckedItems) collection will not correctly update parent checkbox states (tri-state: intermediate/checked/unchecked). This is because child nodes are not created until parent nodes are expanded, so the control cannot locate the [TreeViewNode](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeView.Engine.TreeViewNode.html) to propagate the checkbox state. To use recursive checkbox propagation correctly, `NodePopulationMode` must be set to `Instant`.

### Create Data Model for treeview

Create a simple data source as shown in the following code example in a new class file, and save it as FileManager.cs file:
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