All control's properties disabled in Visual Studio
<p>I have a parent form and a child form that inherits from the former. In design mode all the inherited controls' properties are disabled.  How can I change these properties in the child form?</p>

<p>Here is a screenshot of the designer.  Note how I have selected a text box and all its properties are disabled (greyed out).<a href="https://i.stack.imgur.com/IHVxS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IHVxS.png" alt="Screenshot"></a></p>