JQuery Mutate Plugin on dynamically created object

Hello, I'm using Jquery Mutate Plugin http://www.jqui.net/jquery-projects/jquery-mutate-official/ for changing the size of a div and it was working perfectly, but than I needed this div to be created dinamically through append and then destroy it.

The mutate stop working now and I would like it to work with my dynamically created div as it was working with the static one.


This is the code for the static one:

	$("#user_home_left_column").mutate("height", function(obj, msg){
		
		user_wall_vertical_line_height = $(obj).height() != 0 ? $(obj).height() : user_wall_vertical_line_height;
		$("#user_activity_vertical_line").css("height", (user_wall_vertical_line_height - 155) + "px");
	});

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Please help. Thanks.