title: How to add buttons on different tabs using TabControl in WPF
body: <p>I have the basic tabs made and I want each tab to have a different set of buttons, but the button is added to the main window and no the tab. When i go to the code and cut the button and paste it to the tab I want it to be, it works but only for 1 button, then for the second button I get an error message:</p>
  
  <p>"The object <code>TabItem</code> already has a child and cannot add <code>Button.TabItem</code> can accept only one child."</p>
  
  <p>This is how the code looks like:</p>
  
  <pre><code>xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="394" Width="570"&gt;
  &lt;Grid&gt;
      &lt;Grid.ColumnDefinitions&gt;
          &lt;ColumnDefinition Width="0*" /&gt;
          &lt;ColumnDefinition Width="548*" /&gt;
      &lt;/Grid.ColumnDefinitions&gt;
      &lt;TabControl Margin="9,30,11,10" Name="tabControl1" Grid.Column="1" SelectionChanged="tabControl1_SelectionChanged"&gt;
          &lt;TabItem Name="Admin" Header="Admin"&gt;
  
          &lt;/TabItem&gt;
          &lt;TabItem Name="Staff" Header="Staff" /&gt;
          &lt;TabItem Name="Student" Header="Student" /&gt;
          &lt;TabItem Name="Diary" Header="Diary" /&gt;
          &lt;TabItem Name="Timetables" Header="Timetables" /&gt;
          &lt;TabItem Name="Assignments" Header="Assignments" /&gt;
          &lt;TabItem Name="Courses" Header="Courses" /&gt;
      &lt;/TabControl&gt;
      &lt;Menu Height="16" Name="menu1" VerticalAlignment="Top" Grid.Column="1" /&gt;
      &lt;Button Grid.Column="1" Height="23" HorizontalAlignment="Left" Margin="18,64,0,0" Name="button1" VerticalAlignment="Top" Width="118"&gt;Add/Edit Student&lt;/Button&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p>I want to implement the "button1" inside of the "Admin" tab</p>
  
  <p>It works but it fails when I do a second button</p>
  
  <p>Thanks in advance</p>