将用户控件加载到tabcontrol中

Question

I want to put two usercontrols into the tabcontrol, but only when I click on a button the usercontrol will load the data

<Button Click="Button_Click_1" />
<Button Click="Button_Click_2" />
<TabControl>
    <ItemsControl Name="tab1">
        <local:UserControl1 Loaded="UserControl1_Loaded"></local:UserControl1>
    </ItemsControl>
    <ItemsControl Name="tab2">
         <local:UserControl1 Loaded="UserControl2_Loaded"></local:UserControl1>
    </ItemsControl>
</TabControl>

Answer 1

private class  TabSource 
{
   private string dataForTab = string.empty; 
   public string DataForTab { get { return dataForTab; } } 
   public void GetRealData()
   {
      dataForTab = "Real Data";
      NotifyPropertyChanged("DataForTab");
   }
}


public Button_Click_2(...)
{
    MyTabSource.GetRealData();       
}