Thank you very much Bonnie and Kevin.
I will apply your suggestion

>Ricardo,
>
>You didn't ask about this, but I wanted to point something out ... as you no doubt discovered, there is no way to visually sub-class the basic Winform controls (like Buttons, TextBoxes, etc.) without putting the control on a UserControl, as you have done. However, you don't *have* to do it this way if you create your sub-classes in code, rather than visually. With controls like Buttons, TextBoxes, ComboBoxes, etc, this is very easy to do.
>
>You may have seen some of the threads here recently advocating (or not) putting multiple classes into one .cs file. Here is an example of what I mean:
>

>using System;
>using System.Drawing;
>using System.Collections;
>using System.ComponentModel;
>using System.Windows.Forms;
>using System.Data;
>
>namespace MyCompany.WinUI.MyClasses
>{
>	public class MyComboBox : System.Windows.Forms.ComboBox
>	{
>		// code here
>	}
>
>	public class MyTextBox : System.Windows.Forms.TextBox
>	{
>		// code here
>	}
>
>	public class MyButton : System.Windows.Forms.Button
>	{
>		// code here
>	}
>}
>

>If you're in the "one file should contain only one class" camp, then you can break the above up into separate .cs files.
>
>Basically creating the classes in code gets rid of the need to put the Button on a UserControl. The only downside is that you don't see anything visually, but honestly, with something like a sub-class for a TextBox or Button or any of these simple controls, I see no need for visually designing them.
>
>Then, you can add them to your ToolBox, as Kevin outlined in his reply.
>
>I hope this gives you some food for thought.
>
>~~Bonnie
>
>
>
>
>
>
>
>>I have created a new visual element type "user control" in C#. For example, a personalized command button.
>>This has generated a file with extension .CS.
>>Fine! now I need to insert this control called "myButton" in any winform that I create, how can I do this?
>>
>>My idea is be able to create visual personalized controls ( buttons, lists, checkboxes, etc ) in a class library like in VFP.
>>But I want to start for the beginning and to create a simple personalized visual control and to use it in my winforms