title: WPF "Value of type 'Grid' cannot be converted to 'Control'
body: <p>I am trying to create a Function.</p>
  
  <p>One of the parameters is <code>Control</code> (<code>System.Windows.Controls.Control</code>)</p>
  
  <p>Some of the controls as <code>Buttons</code> or <code>TextBoxes</code> are acceptable.</p>
  
  <p>Although <code>Grid</code> or <code>Images</code> return an error.</p>
  
  <p><img src="https://i.imgur.com/9lydQfy.png" alt="failed code"></p>
  
  <p>All of them are Controls and belong in the Namespace <code>System.Windows.Controls</code> </p>
  
  <p>Why some of these are accepted and some are not?</p>