What is devexpress-blazor-combobox?

A guide for adding DevExpress's searchable drop-down selector to Blazor applications, including Server, WebAssembly, and Hybrid apps.

Use it to build searchable, grouped, multi-column, or dependent selectors, including selectors with large lists and form validation.

It explains how to connect the selector to data and configure common behaviors without piecing together the component's many settings yourself.

devexpress-blazor-combobox — Skill for Claude Code by DevExpress

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add DevExpress/agent-skills --skill devexpress-blazor-combobox

Clone the repo

git clone --depth 1 https://github.com/DevExpress/agent-skills

Made for: Claude Code.

Or install dx-blazor, the plugin that ships this one along with the rest of its 10 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/devexpress/agent-skills/devexpress-blazor-combobox/github.svg)](https://agentmods.dev/skills/devexpress/agent-skills/devexpress-blazor-combobox)

Your own site

<a href="https://agentmods.dev/skills/devexpress/agent-skills/devexpress-blazor-combobox"><img src="https://agentmods.dev/badge/skills/devexpress/agent-skills/devexpress-blazor-combobox/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/devexpress/agent-skills/devexpress-blazor-combobox"><img src="https://agentmods.dev/badge/skills/devexpress/agent-skills/devexpress-blazor-combobox.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,292 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Anti-Refusal · line 242
Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.

Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00117	$0.04292
Opus 5	$0.00059	$0.02146
Sonnet 5	$0.00023	$0.00858
Haiku 4.5	$0.00012	$0.00429

Measured 11d ago against content hash d40b917f7096, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

devexpress-blazor-combobox scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/dx-blazor/skills/devexpress-blazor-combobox/SKILL.md · 266 lines

How it starts

The opening of the file, as written. The whole thing — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DevExpress Blazor ComboBox

DxComboBox<TData, TValue> is a text editor with a searchable drop-down list. It binds to strongly-typed collections or custom objects, supports multi-column layouts, grouping, virtual scrolling, cascading dropdowns, and fully customizable item and edit-box templates.

When to Use This Skill

Add a single-selection dropdown or selector to a Blazor form
Bind to any IEnumerable<T>, IQueryable<T>, or async collection
Enable live search/filter as the user types
Display grouped items with a group header
Create cascading (dependent) dropdowns
Show multiple columns in the drop-down list
Customise item rendering via ItemDisplayTemplate or EditBoxDisplayTemplate
Add a Clear button, custom command buttons, or placeholder text
Validate ComboBox selection inside a standard <EditForm>
Use virtual scrolling for large lists

Prerequisites & Installation

NuGet Package

Package	Purpose
`DevExpress.Blazor`	ComboBox + all standard Blazor UI components

# Install from NuGet.org:
dotnet add package DevExpress.Blazor

Setup (existing project)

Register DevExpress services in Program.cs:
```
builder.Services.AddDevExpressBlazor();
```
v26.1 note: DevExpress.Blazor no longer includes options.BootstrapVersion or DevExpress.Blazor.BootstrapVersion. Do not generate either API.

Apply a theme and add client scripts in App.razor:

@DxResourceManager.RegisterTheme(Themes.Fluent)
@DxResourceManager.RegisterScripts()

Add the namespace to _Imports.razor:
```
@using DevExpress.Blazor
```

Before You Start — Ask the Developer

If the host agent has a structured question-asking tool available, use it to ask these questions one at a time with clear options — for example, Claude Code's AskUserQuestion tool or GitHub Copilot's askQuestions tool. If no such tool is available, ask the questions directly in the chat response before generating code.

Read the full file on GitHub · 266 lines

Files

What ships with it

12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

11d ago First seen · 266 lines · 117 tokens per session scan A d40b917f7096

Subscribe to this mod's changes

devexpress-blazor-combobox is a skill published in the GitHub repository DevExpress/agent-skills (52 stars, last pushed 24d ago), licensed MIT. It adds 117 tokens to every session and 4,292 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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