title: Can not change the value of a combobox in an user control from another form
body: <p>I have an user control in Autocad that makes drawings based on certain criteria.
  From this user control, another form can be opened which is used to fill in specific data.
  When i try to automatically change the Combobox in the User Control with data from the Form, it gives the error:</p>
  
  <blockquote>
    <p>Reference to a non-shared member requires an object reference.</p>
  </blockquote>
  
  <p>Now I have looked this up on the internet, but I can not seem to apply the solutions given.
  My situation is as follows:</p>
  
  <pre><code>Partial Public Class Partial Public Class User_Control
      Private Form1 As New Form_Something
    private sub button1_click(sender As Object, e As EventArgs) Handles button1.Click
      Form1.show()
    End sub
  End Class
  </code></pre>
  
  <p>This User Control has got a Combobox, lets name it Combobox1.  Now when i change a value on Form_Something, Combobox1 must change as well.
  So I've got the following code in Form1:</p>
  
  <pre><code>Partial public class Form_Something
      Public Sub Button1_Click(sender As Object, e As EventArgs) Handles BT_Apply.Click
         User_Control.Combobox1.text = "Apples"
      End sub
  End class
  </code></pre>
  
  <p>This gives the mentioned error.
  Can someone please help me resolve this issue, because I'd like to do this with multiple comboboxes/labels etc.</p>