How to style RadTreeViewItem in code behind?

[Greg]

Hello, can someone tell me how to style a RadTreeViewItem purely in code behind?

I did read this article: http://docs.telerik.com/devtools/wpf/controls/radtreeview/styles-and-templates/styling-and-appearance-styling-radtreeviewitem#modifying-the-default-style

but I don't want to use XAML at all and I don't know how to access those properties in code.

[Dinko | Tech Support Engineer]

Hi Greg,

Let me first start with that it is not a good practice to specify a custom style in code behind. If you still consider setting a custom style of the RadTreeViewItems in code behind you can take a look at the sample example below.

public MainWindow()
{
    InitializeComponent();

    Style customStyle = new Style();
    customStyle.TargetType = typeof(RadTreeViewItem);

    Setter setter = new Setter();
    setter.Property = TextBlock.ForegroundProperty;
    setter.Value = Brushes.Green;

    Setter setter2 = new Setter();
    setter2.Property = RadTreeViewItem.IsExpandedProperty;
    setter2.Value = true;

    customStyle.Setters.Add(setter);
    customStyle.Setters.Add(setter2);

    this.myTree.ItemContainerStyle = customStyle;
}

By setting the custom style to the ItemContainerStyle property of the RadTreeView you can applied it to all tree items in the tree.

Another approach that you can try is to create a custom ResourceDictionary where you specify the custom style and applied to the RadTreeViewItems.

You can take a look at the following MSDN resources which could be in handy for your case.

• Style Class
• Style.Setters Property
• ResourceDictionary Class

Hope this information is useful.

Regards,
Dinko
Telerik

[Greg]

Thank you, this has been very helpful!