Problems closing tabs

I've a WPF app organized with tabs. I added a small button to each tabitem header that allow the user to close the tab.

When the user click on the small button, I remove the tabItem from the tabControl.

tabControl.Items.Remove(tabItem);

As result of this the tabItem dissapears, and that is fine, but here comes the problem:

The TabItem is not visible(good), but it still exists(bad). If I put a timer inside, the timer execucutes his Tick, and more important, if I've a datagrid with 200.000 records and I close the Tab, The garbage collector don't release the memory as I expected.

I asked google about the problem and I've implemented some of the advices described. It didn't work.

Can anyone help me? Thanks

From stackoverflow

• Place a user control in your tab, and in the Usercontrol code, handle its own "Unloaded" event.

  In there you should be able to clean-up. (unless your timer is preventing the control from unloading, but last time I tried something similar it worked).

  And yes, WPF is very dangerous for all those things, if you are not careful you can bleed controls pretty fast...

• This is what I've been using, and as far as I can tell it removes the tabitem from memory. The problem with leaving a timer inside of the tabitem, is that the GC won't collect and dispose of it because it detects that the timer is still in use.

  The Code:

  namespace Reports.Controls
  {
      /// <summary>
      /// Interaction logic for Test.xaml
      /// </summary>
      public partial class ReportTab : TabItem
      {
          public delegate void CloseEvents(ReportTab TabIndex);
          public event CloseEvents Closing;
  
          public ReportTab(string Title)
          {
              InitializeComponent();
              tbTitle.Text = Title;
          }
  
          private void Image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
          {
              Closing(this);
          }
      }
  }
  

  The xaml:

  <TabItem x:Class="Reports.Controls.ReportTab"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      >
      <TabItem.Header>
          <StackPanel Orientation="Horizontal">
              <TextBlock Text="Main" Name="tbTitle" Margin="0,0,8,0"/>
              <Image Height="13" 
                     Source="pack://application:,,/Images/Icons/close.png"
                     MouseLeftButtonUp="Image_MouseLeftButtonUp"/>
          </StackPanel>
      </TabItem.Header>
      <Grid>
           //Tabitem stuff
      </Grid>
  </TabItem>
  

  Here's the page with the Tabcontrol to add a tab:

  void AddTab(string Title)
  {
      Controls.ReportTab rt = new Controls.ReportTab(Title);
      rt.Closing += new Controls.ReportTab.CloseEvents(rt_Closing);
      tabControl.SelectedIndex = tabControl.Items.Add(rt);
  }
  
  /// <summary>
  /// Moves the Tab Control back to the Main tab
  /// after a tab is removed
  /// </summary>
  /// <param name="TabIndex"></param>
  void rt_Closing(Controls.ReportTab TabIndex)
  {
      tabControl.Items.Remove(TabIndex);
      //This resets the tabcontrol back to it's first tabindex
      tabControl.SelectedIndex = 0;
  
  }