Develop Reference

How do I update/overwrite a custom toolbox item in Visual Studio?

I've managed to successfully implement this custom TabControl project. I'm Building this TabControl project as a .dll file so I can drag it into my other project's toolbox and view the custom control in the designer but when I wanted to change something in the this custom TabControl project, when I rebuild the .dll file and drag it in the toolbox again, it doesn't update the existing custom controls in the designer.
When I ctrl+m1 the variables in the custom control in use, it links to read-only metadata.
Do I need to remove all the custom controls first whenever I make a change or is there a way to "update" existing custom toolbox items that are already in the designer?

I tested this issue in vs2019 and vs2022, and it worked perfectly.
When the dll is rebuilt, it does not need to be reloaded into the toolbox.
If the program page that depends on the dll is not updated, just rebuild it.
My test environment is .Net Framework 4.8.
If you have any questions about this, please let me know and I will continue to follow up.

Visual Studio not addin custom user control to toolbox

I created a new C# WPF app project in visual studio 2017 and added a user control to the project. Now when I try to add that user control to my main window it doesnt show up in the toolbox.
Ive checked the AutoToolboxPopulate property and it is set to true and Ive rebuilt. Ive tried closing and opening the project and Visual Studio.
What do I need to do to get my controls to show up in the toolbox?

You can try to add it to the toolbox manually
In the toolbox, select the WPF Components. At this time, click Browse, find the dll, add it, and click OK.

I accidentally made a normal user control instead of a WPF user control.

How to add a Custom Windows Forms Control into Visual Studio Toolbox

I want to add my custom control into the VS Toolbox. But I need it to appear in toolbox always when a new project is open. How can I do that?

Create a VSIX package to install the control
You can create a VSIX package to distribute and install user controls to toolbox.
To do so, you can create a VSIX Project and add a Windows Forms ToolBox Control to the project. The control is decorated with a ProvideToolboxControl attribute which determines the tab that the control will appear in. You can pass an existing or a new tab name to the attribute:
[ProvideToolboxControl("Some Tab Name", false)]
public partial class ToolboxControl1 : UserControl
You can also fill the information in .vsixmanifest file. Then when you build the project, it creates a .vsix package file in \bin\debug folder of the project which you can distribute this file. If you run the file, it installs the control in visual studio toolbox.
More information:
Walkthrough: Creating a Windows Forms Toolbox Control
Note:
VS 2013 has a Windows Forms ToolBox Control Project Template under extensibility group of new project window and you can use it to create the project. Starting from VS 2015 you should use VSIX Project template.
Manually Add Control to Toolbox
You can copy the dll of your control to a permanent location. Then right click on ToolBox, for example on general tab, then click Choose Items ... then in Choose Toolbox Items window in .Net Framework Components Tab, click Browse... button and open the dll of your control. Then in the components list, check the control and click OK button. The control will appear under the selected tab. You also can add your own tab simply by right click and choose Add Tab.

Subclassed component to the own tab in toolbox

I want to add my own component to the toolbox in visual studio 2015 but I want to use my own tabname, or if that's not possible the general tab, I guess I need to use reflection for that, but how ?
I wrote a subclassed component and I want to install this in the component toolbox, this component appears in the "All Windows forms" tab, but I want to install it in my own tab like "myComponents"

Adding Custom UserControl to Visual Studio 2005's Toolbox

I'm using Visual Studio 2005 for a project I'm working on right now. I've created a new, custom control that inherits from 'UserControl'. Now I need to add that control to another Windows Form within the same project. I thought that the IDE would place this custom control into the Toolbox (as I know it's done in the past when I was using Visual Studio 2008), however, it did not. Now, I'm unsure how to get the control added to my form correctly and/or how to make it show up as it should in the Toolbox. The "Auto Toolbox Populate" option under Tools is set to 'True', so I really don't know what else needs to happen at this point. The help of anyone who's had any experience with this would be greately appreciated. Thanks a lot!

You may first build your custom control and create a dll. Then,
Right-click on the Toolbox panel -> Select 'Choose Items' -> Go to '.NET framework components' tab in the 'Choose Toolbox Items' dialog box that appears - > Browse to the dll of your custom user control -> Click OK.
Now the user control will be displaying in your tool box.
Hope this helps...

Try this
Open Solution
Build project
Open your form
Reset the toolbox
Drag the user control from solution explorer to the toolbox
Close the toolbox and all open documents
Open toolbox then the form
User control should appear
worked for me.