---
title: "How to: Display a Control in the Choose Toolbox Items Dialog Box"
ms.date: "08/23/2019"
helpviewer_keywords:
  - "global assembly cache [Windows Forms], Choose Toolbox Items dialog box"
  - "AssemblyFoldersEx [Windows Forms], Choose Toolbox Items dialog box"
  - "controls [Windows Forms], display in Choose Toolbox Items dialog box"
  - "assembly folder registration [Windows Forms], Choose Toolbox Items dialog box"
  - "Choose Toolbox Items dialog box [Windows Forms], display control"
ms.assetid: 01ef6eba-d044-40f0-951d-78eff7ebd9a9
---
# How to: Display a Control in the Choose Toolbox Items Dialog Box

As you develop and distribute controls, you may want those controls to appear in the **Choose Toolbox Items** dialog box of Visual Studio, which is displayed when you right-click the **Toolbox** and select **Choose Items**. You can enable your control to appear in this dialog box by using the AssemblyFoldersEx registration procedure.

To display your control in the Choose Toolbox Items dialog box:

- Install your control assembly to the global assembly cache. For more information, see [How to: Install an Assembly into the Global Assembly Cache](/dotnet/framework/app-domains/install-assembly-into-gac).

  -or-

- Register your control and its associated design-time assemblies by using the AssemblyFoldersEx registration procedure. AssemblyFoldersEx is a registry location where third-party vendors store paths for each version of the framework that they support. Design-time resolution can look in this registry location to find reference assemblies. The registry script can specify the controls you want to appear in the Toolbox.

## See also

- [Developing Windows Forms Controls at Design Time](developing-windows-forms-controls-at-design-time.md)
- [How to: Install an Assembly into the Global Assembly Cache](/dotnet/framework/app-domains/install-assembly-into-gac)
- [Walkthrough: Automatically Populating the Toolbox with Custom Components](walkthrough-automatically-populating-the-toolbox-with-custom-components.md)
