See this: enter these codes into UserControl resources
<Style TargetType='sdk:TabItem'>
<Setter Property='HeaderTemplate'>
<Setter.Value>
<DataTemplate>
<StackPanel Orientation='Horizontal'
Background='Transparent'>
<TextBlock Text='{Binding}' />
<Button x:Name='btnCloaseTab'
Click='btnCloaseTab_Click'
VerticalAlignment='Center'
Style="{StaticResource CloseButton}"
Margin="5,0,0,0"
Content="M0,0 L6,6 M6, 0 L0,6"
ToolTipService.ToolTip="بستن زبانه" />
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
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