>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 > } >} >>That's it. These controls can't be sub-classed visually, but as you can see, it's easy enough to do it in code. I have all the basic controls sub-classed in one class library file. Once they're added to the ToolBox, then can be dragged onto any design surface in the IDE.