title: Open User Control from user control in main window grid WPF
body: <p>Maybe first I will tell about my application.
  When for example an employee will log into my application, he will have loaded "Employee Menu":</p>
  
  <pre><code>    Dim Empl As New Employee
  MainGrid.Children.Add(Empl)
  Grid.SetRow(Empl, 1)
  </code></pre>
  
  <p>This is from Window_Loaded event. Menu is User Control, and there I have few buttons to open and operate another user controls. When I press for example button "Question":</p>
  
  <pre><code>Public Class Employee
      Dim mw As New MainWindow
      Private Sub btnQuestionAdd_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles btnQuestionAdd.Click
          Dim Que As New QuestionAdd
          mw.MainGrid.Children.Add(Que)
          Grid.SetRow(Que, 2)
          Grid.SetColumn(Que, 1)
      End Sub
  End Class
  </code></pre>
  
  <p>I don't know why nothing is loading after button_click.....
  Is it so hard to navigate main windows grid from other controls?</p>