title: UserForm won't show
body: <p>I'm using office developer tools and made a ribbon to access some functions. Thing is, it looks like I can't open a userform from a button, other commands seems to run normally.
  Code:</p>
  
  <pre><code>Public Class Empresa
      Private Sub Button1_Click(sender As Object, e As RibbonControlEventArgs) Handles btn_DBSol.Click
          'Dim wnd As New frm_DBSolventes
          'wnd.Show()
          MsgBox("Hello World")
      End Sub
  End Class
  </code></pre>
  
  <p>This code have this result on excel ribbon:</p>
  
  <p><a href="https://s24.postimg.org/6z16l6g43/Print_1.jpg" rel="nofollow noreferrer">https://s24.postimg.org/6z16l6g43/Print_1.jpg</a></p>
  
  <p>Now using this code: </p>
  
  <pre><code>Public Class Empresa
      Private Sub Button1_Click(sender As Object, e As RibbonControlEventArgs) Handles btn_DBSol.Click
          Dim wnd As New frm_DBSolventes
          wnd.Show()
          'MsgBox("Hello World")
      End Sub
  End Class
  </code></pre>
  
  <p>Results in nothing: </p>
  
  <p>There are no errors on Error List window. frm_DBSolventes is a userform on a userform referenced project, there is nothing on the form right now, just made a new project of userform and trying to show it. Is there something I'm missing? Is there any other way where I can use a userform on ribbon?</p>
  
  <p>As Requested the frm_DBSolventes is</p>
  
  <p><a href="https://s29.postimg.org/6w6ae15qd/Print_3.jpg" rel="nofollow noreferrer">https://s29.postimg.org/6w6ae15qd/Print_3.jpg</a></p>
  
  <p>Just add a datagridview cause I need to continue working. if it makes difference I can change it. There is no code on the form: </p>
  
  <pre><code>Public Class frm_DBSolventes
  
  End Class
  </code></pre>