Depth Controlling Problem with mx.behaviors.DepthControl class

Greetings for everybody.
I am using mx.behaviors.DepthControl class for my latest project for controlling z-order of the dynamically created movieclips. If anybody came across above class or familiar with that class, I appreciate your help because, I am having a problem with sendBackward and sendtoBack methods. When I try to use these methods, flash stucks.

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