WPF中如何获取ControlTemplate中的对象

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<TabItem Name="RootTabItem" Background="Transparent">
	<TabItem.Template>
		<ControlTemplate TargetType="TabItem">
			<Button Name="btnTabItem">
				<Button.Template>
					<ControlTemplate TargetType="Button">
						<StackPanel Orientation="Horizontal" Background="Transparent">
							<local:IconButton x:Name="btnSend" ToolTip="send"
								   Icon="/Resources/Icon/sendIcon.png"/>
						    <local:IconButton x:Name="btnCut" ToolTip="cut"
								   Icon="/Resources/Icon/cutIcon.png"/>
						</StackPanel>
					</ControlTemplate>
				</Button.Template>
			</Button>
		</ControlTemplate>
	</TabItem.Template>
</TabItem>

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DependencyObject d1 = VisualTreeHelper.GetChild(RootTabItem,0);
Button button = LogicalTreeHelper.FindLogicalNode(d1,"btnTabItem") as Button;
DependencyObject d2 = VisualTreeHelper.GetChild(button,0);
IconButton iconButton = LogicalTreeHelper.FindLogicalNode(d2,"btnSend") as IconButton;