TabControl's TabItem's sharing same content when ItemSource bind with collection of TabItems

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C#

C#4.0

Silverlight5

I want to create a UserControl template by deriving from TabControl and I'm binding my collection of TabItems with the ItemsSource of tabControl. but it doesn't switching the content of the tab items when tab item selection changes, all the tabs are sharing same content (default-content of very first tab). here is Xaml of my user control template.

<tabcontrol itemssource="MyCollection">
</tabcontrol>

also if I create ItemsTemplate, it fails to work

<tabcontrol itemssource="MyCollection">
 <tabcontrol.itemstemplate>
  <datatemplate>
   <tabitem header="{Binding Header}" content="{Binding Content}">
  </tabitem>
</datatemplate>
</tabcontrol.itemstemplate></tabcontrol>

I dont know why this is happening.plz help..Any response will be appreciated....

Thanks, GK Prajapati