Touch event for tee chart in android

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http://androidforums.com – Hi I am very new to android. I want to render a pie chart in android using tee chart. I can able to render a piechart but but i want when i touch a perticular slice of pie that must be drill down and render another pie chart .Any one of you plase help :) thanks in advance Thanks & Regard, Manasa Mandalapu (General)