How to lock in a single skeleton in Microsoft Kinect SDK v 1.7 using vc++?

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VisualC++

Kinect

SDK

Hi,
I m trying to lock a single skeleton using Microsoft Kinect SDK v 1.7 . My requirements are
• First lock a single skeleton.
• Check the tracking state of the of the locked skeleton.
• If the tracking state of the locked skeleton is NOT Tracked,then
• ----->check for the next closest skeleton
• ----->lock this skeleton.
How do I do this using vc++2010. The code which i tried is given below.

<pre lang="c++">

TrackSingleSkeleton(NUI_SKELETON_FRAME* pSkeletonFrame)
{
	DWORD dwTrackingIDs[NUI_SKELETON_MAX_TRACKED_COUNT]={0, 0};
	m_pNuiSensor->NuiSkeletonTrackingEnable(m_hNextSkeletonEvent,NUI_SKELETON_TRACKING_FLAG_TITLE_SETS_TRACKED_SKELETONS);
	 for (int i = 0; i < NUI_SKELETON_COUNT; i++)
	 {
		const NUI_SKELETON_DATA & skeleton = pSkeletonFrame->SkeletonData[i];
		if (skeleton.eTrackingState == NUI_SKELETON_TRACKED)
	      {	
			dwTrackingIDs[0] = skeleton.dwTrackingID;
			dwTrackingIDs[1] = 0; // or 0, if you want to track only one
			
		 }

		 else if(skeleton.eTrackingState == NUI_SKELETON_POSITION_ONLY)
		 {			 
			dwTrackingIDs[0] = skeleton.dwTrackingID;
			dwTrackingIDs[1] = 0;
		 }
		 if (dwTrackingIDs[0] > 0)
		 {
			m_pNuiSensor->NuiSkeletonSetTrackedSkeletons(dwTrackingIDs); // Track this skeleton
		 }
	 }
	//m_pNuiSensor->NuiSkeletonSetTrackedSkeletons(dwTrackingIDs);

	 
}

But here i m not able to lock the skeleton.Help pls...

Regards,
Sandhya.