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+---
+title: Extend or Inherit Telerik Blazor Components
+description: Learn how to extend, inherit, wrap, and reuse Telerik UI for Blazor components, so that the app uses a Telerik component instance with similar settings or behavior at multiple places.
+type: how-to
+page_title: How to Extend, Inherit, or Wrap Telerik Components for Blazor
+slug: common-kb-component-inheritance
+tags: telerik, blazor, inheritance
+ticketid: 1628856, 1615737, 1604776, 1607228, 1618168
+res_type: kb
+---
+
+## Environment
+
+<table>
+    <tbody>
+        <tr>
+            <td>Product</td>
+            <td>UI for Blazor</td>
+        </tr>
+    </tbody>
+</table>
+
+## Description
+
+This KB answers the following questions:
+
+* How to extend and customize Telerik components?
+* How to inherit Telerik components and change their properties or methods?
+* How to wrap and reuse Telerik components for Blazor?
+
+## Solution
+
+There are two ways to extend, inherit, reuse or wrap Telerik components for Blazor. Both of them are demonstrated in the [example below](#example).
+
+* [Composition&mdash;wrap the Telerik component in another Razor component](#wrap-telerik-components)
+* [Inheritance&mdash;inherit the Telerik component in a C# class](#inherit-telerik-components)
+
+The sections below discuss the differences between the two alternatives. On the other hand, both options allow you to:
+
+* Reuse a Telerik component with similar or identical configuration at multiple places in your app.
+* Add new parameters.
+* Set default values to parameters, so that there is no need to do that everywhere in the app.
+
+On the other hand, neither option allows changing the internal HTML rendering of the Telerik component.
+
+> Using both options at the same time is not possible and will lead to runtime exceptions, because such a setup will nest a Telerik component in itself. The following JavaScript error will likely occur: `Cannot read properties of null (reading addEventListener)`.
+
+### Wrap Telerik Components
+
+This approach allows you to add additional markup or another components next to the Telerik component.
+
+1. Add the Telerik component to a separate `.razor` file, for example, `MyReusableComponent.razor`.
+1. Implement the desired `MyReusableComponent` parameters and set the required parameters of the Telerik component.
+1. Add any other optional content next to the Telerik component.
+
+### Inherit Telerik Components
+
+This approach allows you to modify the built-in API and life cycle events of the Telerik component.
+
+1. Create a class that inhefits from a Telerik component class, for example, `MyInheritedComponent.cs`.
+1. Implement API member overrides or change default API member values.
+
+## Example
+
+The following example includes three files:
+
+* `Home.razor` is the component (page) that consumes the inherited and wrapped Telerik components.
+* `ReusableComboBox.razor` shows a wrapped Telerik ComboBox.
+* `InheritedComboBox.cs` shows an inheriteed Telerik ComboBox.
+
+Adjust the `YourAppName.BaseComponents` namespace in `Home.razor` and `InheritedComboBox.cs` to run the code successfully in your app.
+
+<div class="skip-repl"></div>
+
+````Home.razor
+@page "/"
+
+@using YourAppName.BaseComponents
+
+<p><strong>Telerik ComboBox</strong></p>
+
+<TelerikComboBox Data="@ListItems"
+                 @bind-Value="@SelectedValue"
+                 GroupField="@nameof(ListItem.Category)"
+                 TextField="@nameof(ListItem.Text)"
+                 ValueField="@nameof(ListItem.Id)"
+                 Class="my-combobox"
+                 Filterable="true"
+                 FilterOperator="@StringFilterOperator.Contains"
+                 Width="200px" />
+
+<p style="margin-top:2em"><strong>Inherited ComboBox</strong> with additional API and default property values</p>
+
+<InheritedComboBox @ref="@InheritedComboBoxRef"
+                   Data="@ListItems"
+                   @bind-Value="@SelectedValue"
+                   GroupField="@nameof(ListItem.Category)"
+                   TextField="@nameof(ListItem.Text)"
+                   ValueField="@nameof(ListItem.Id)"
+                   CustomParameter="foo" />
+
+<TelerikButton OnClick="@OnInheritedButtonClick">@InheritedComboBoxCustomProperty</TelerikButton>
+
+<p style="margin-top:2em"><strong>Reusable ComboBox</strong> with additional rendering, API and default parameter values</p>
+
+<ReusableComboBox @ref="@ReusableComboBoxRef"
+                  Data="@ListItems"
+                  @bind-Value="@SelectedValue"
+                  GroupField="@nameof(ListItem.Category)"
+                  TextField="@nameof(ListItem.Text)"
+                  ValueField="@nameof(ListItem.Id)" />
+
+<TelerikButton OnClick="@OnReusableButtonClick">@ReusableComboBoxCustomProperty</TelerikButton>
+
+<style>
+    .my-combobox {
+        border-color: blue;
+    }
+</style>
+
+@code {
+    private InheritedComboBox<ListItem, int>? InheritedComboBoxRef { get; set; }
+    private ReusableComboBox<ListItem, int>? ReusableComboBoxRef { get; set; }
+
+    private List<ListItem> ListItems { get; set; } = new();
+
+    private int SelectedValue { get; set; } = 3;
+
+    private string InheritedComboBoxCustomProperty { get; set; } = "Get Custom ComboBox Property";
+    private string ReusableComboBoxCustomProperty { get; set; } = "Get Custom ComboBox Property";
+
+    private void OnInheritedButtonClick()
+    {
+        InheritedComboBoxCustomProperty = InheritedComboBoxRef?.CustomProperty ?? "Error";
+    }
+
+    private void OnReusableButtonClick()
+    {
+        ReusableComboBoxCustomProperty = ReusableComboBoxRef?.CustomProperty ?? "Error";
+    }
+
+    protected override void OnInitialized()
+    {
+        ListItems = new List<ListItem>();
+
+        for (int i = 1; i <= 24; i++)
+        {
+            ListItems.Add(new ListItem()
+            {
+                Id = i,
+                Text = $"Item {i}",
+                Category = $"Category {i % 6 + 1}"
+            });
+        }
+
+        base.OnInitialized();
+    }
+
+    public class ListItem
+    {
+        public int Id { get; set; }
+        public string Text { get; set; } = string.Empty;
+        public string Category { get; set; } = string.Empty;
+    }
+}
+````
+````ReusableComboBox.razor
+@using System.Linq.Expressions
+
+@typeparam TItem
+@typeparam TValue
+
+<span style="display: flex; gap: 1em; align-items: center;">
+    <label for="@Id" style="font-size: var(--kendo-font-size)">@Label</label>
+    <TelerikComboBox Data="@Data"
+                     Value="@Value"
+                     ValueChanged="@( (TValue newValue) => ComboBoxValueChanged(newValue) )"
+                     ValueExpression="@ValueExpression"
+                     GroupField="@GroupField"
+                     TextField="@TextField"
+                     ValueField="@ValueField"
+                     Filterable="true"
+                     FilterOperator="@StringFilterOperator.Contains"
+                     Class="my-combobox"
+                     Id="@Id"
+                     Width="200px" />
+</span>
+
+@code {
+    [Parameter]
+    public IEnumerable<TItem>? Data { get; set; }
+
+    [Parameter]
+    public TValue? Value { get; set; }
+
+    [Parameter]
+    public EventCallback<TValue?> ValueChanged { get; set; }
+
+    [Parameter]
+    public Expression<Func<TValue?>>? ValueExpression { get; set; }
+
+    [Parameter]
+    public string? GroupField { get; set; }
+
+    [Parameter]
+    public string? TextField { get; set; }
+
+    [Parameter]
+    public string? ValueField { get; set; }
+
+    [Parameter]
+    public string Label { get; set; } = "Select Value";
+
+    private readonly string Id = $"id-{Guid.NewGuid()}";
+
+    public string CustomProperty
+    {
+        get
+        {
+            return $"Custom Reusable Property {DateTime.Now.Millisecond}";
+        }
+    }
+
+    private async Task ComboBoxValueChanged(TValue newValue)
+    {
+        Value = newValue;
+
+        if (ValueChanged.HasDelegate)
+        {
+            await ValueChanged.InvokeAsync(Value);
+        }
+    }
+}
+````
+````InheritedComboBox.cs
+using Microsoft.AspNetCore.Components;
+using Telerik.Blazor.Components;
+
+namespace YourAppName.BaseComponents
+{
+    public class InheritedComboBox<TItem, TValue> : TelerikComboBox<TItem, TValue>
+    {
+        public InheritedComboBox()
+        {
+            Class = "my-combobox";
+            Filterable = true;
+            FilterOperator = Telerik.Blazor.StringFilterOperator.Contains;
+            Width = "200px";
+        }
+
+        [Parameter]
+        public string CustomParameter { get; set; } = string.Empty;
+
+        public string CustomProperty
+        {
+            get
+            {
+                return $"Custom Inherited Property {DateTime.Now.Millisecond}";
+            }
+        }
+
+        // Optional method overrides...
+    }
+}
+````
+
+## See Also
+
+* [Using Base Classes with Razor Components](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/?view=aspnetcore-9.0#specify-a-base-class)