Blank gap at the end of a scrollPane?

hello.

i'm having error scroll pane added stage. scrollpane element dynamically created through lines of code. @ end of movieclip contained in scrollpane, though, blank space appears.

 

 

this of code i'm working with:

//variables

var sph:int = 307;

var spw:int = 700;

var spx:int = 0;

var spy:int = 80;

var sp:scrollpane = new scrollpane();

var totalmc:movieclip = new movieclip();

 

//scrollpane properties

sp.setsize(spw, sph);

sp.x = spx;

sp.y = spy;

sp.horizontalscrollpolicy = "off";

 

//totalmc @ point builded , defined

 

//add scrollpane scene

sp.source = totalmc;

addchild(sp);

setchildindex(sp, 3);

 

if add totalmc movie clip stage, gap doesn't show, figured must issue related scrollpane properties themselves.

 

can out there me out?

thanks.

that looks code problem mc build.  trace height , confirm.

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