Is there a workaround if you don't have Flex?

well, in flash you don't need flare vis...and if there's a need to import other classes from flex, try to search for the as file over google, to downlaod it.

i got a flare code at internet from someone, i can't remember who, and made it in flash code just to test if flare works in flash.

here it is...
import flare.animate.Transitioner;
import flare.data.DataSet;
import flare.display.RectSprite;
import flare.display.TextSprite;
import flare.vis.Visualization;
import flare.vis.data.Data;
import flare.vis.data.NodeSprite;
import flare.vis.operator.filter.GraphDistanceFilter;
import flare.vis.operator.layout.RadialTreeLayout;
import flash.display.MovieClip;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.geom.Rectangle;
import flash.net.URLRequest;
import flash.text.TextFormat;

//import panda;

var vis:Visualization;

var maxLabelWidth:Number;
var maxLabelHeight:Number;

var _gdf:GraphDistanceFilter;

var _maxDistance:int = 2;

var _transitionDuration:Number = 2;

function GraphMLFileDemo() {
    var gmr:GraphMLReader = new GraphMLReader(onLoaded);
    gmr.read("janetyc_graphml.xml");
}
function onLoaded(data:Data):void {

    vis = new Visualization(data);

    var w:Number = stage.stageWidth;
    var h:Number = stage.stageHeight;

    vis.bounds = new Rectangle(0, 0, w, h);

    var textFormat:TextFormat = new TextFormat();
    textFormat.color = 0xffffffff;
    var i:int = 0;
    vis.data.nodes.visit(function(ns:NodeSprite):void {
    var ts:TextSprite = new TextSprite(ns.data.tag,textFormat);
    ns.addChild(ts);
    });

    vis.data.nodes.setProperty("x",w/2);
    vis.data.nodes.setProperty("y",h/2);

    maxLabelWidth = getMaxTextLabelWidth();
    maxLabelHeight = getMaxTextLabelHeight();

    vis.data.nodes.visit(function(ns:NodeSprite):void {
    var rs:RectSprite = new RectSprite( -maxLabelWidth/2-1,-maxLabelHeight/2 - 1, maxLabelWidth + 2, maxLabelHeight + 2,5,5);
    if (ns.data.gender == "M") {
    rs.fillColor = 0xff000044;
    rs.lineColor = 0xff000044;
    } else {
    rs.fillColor = 0xffaa0000;
    rs.lineColor = 0xffaa0000;
    rs.alpha = 0.8;
   
    }
    rs.lineWidth = 2;
   
    ns.addChildAt(rs, 0); // at postion 0 so that the text label is drawn above the rectangular box
   
    /*// Add the image thumbnail to the children
    var loader:Loader = new Loader();
    //var url:String = "file.png";
    var url:String = "importado.swf";
    var urlReq:URLRequest = new URLRequest(url);
    loader.load(urlReq);
    loader.x = - 25;
    loader.y = - 5;
   
    rs.addChild(loader); */

    ns.addChildAt(new panda(),1);
    //rs.addChildAt(panda, 1);
       
    ns.size = 0;
    adjustLabel(ns,maxLabelWidth,maxLabelHeight);
   
    ns.mouseChildren = false;
   
    ns.addEventListener(MouseEvent.CLICK, update);
    ns.addEventListener(MouseEvent.ROLL_OVER, getNode);
    ns.buttonMode = true;
    });

    var lay:RadialTreeLayout =  new RadialTreeLayout();
    lay.useNodeSize = false;

    var root:NodeSprite = vis.data.nodes[0];

    _gdf = new GraphDistanceFilter([root], _maxDistance,NodeSprite.GRAPH_LINKS);

    vis.operators.add(_gdf);//distance filter has to be added before the layout
    vis.operators.add(lay);

    addChild(vis);

    updateRoot(root);

}

function getNode(event:MouseEvent):void {

    var n:NodeSprite = event.target as NodeSprite;
    if (n == null) {
        return;
    }
    //n.getChildAt(1).Oi();
    trace("n is " + n.name + "(" + n.x +","+ n.y+ ")");
    trace("n1  is " + n.getChildAt(1).name + "(" + n.x +","+ n.y+ ")");
    //instance30.scaleX = 899;
    //n.panda.RotateCircle();

}

function update(event:MouseEvent):void {

    var n:NodeSprite = event.target as NodeSprite;
    if (n == null) {
        return;
    }
    updateRoot(n);

}
function updateRoot(n:NodeSprite):void {

    vis.data.root = n;

    _gdf.focusNodes = [n];

    var t1:Transitioner = new Transitioner(_transitionDuration);

    vis.update(t1).play();

}
function getMaxTextLabelWidth():Number {
    var maxLabelWidth:Number = 0;
    vis.data.nodes.visit(function(n:NodeSprite):void {
    var w:Number = getTextLabelWidth(n);
    if (w > maxLabelWidth) {
    maxLabelWidth = w;
    }
   
    });
    return maxLabelWidth;
}
function getMaxTextLabelHeight():Number {
    var maxLabelHeight:Number = 0;
    vis.data.nodes.visit(function(n:NodeSprite):void {
    var h:Number = getTextLabelHeight(n);
    if (h > maxLabelHeight) {
    maxLabelHeight = h;
    }
   
    });
    return maxLabelHeight;
}
function getTextLabelWidth(s:NodeSprite):Number {
    var s2:TextSprite = s.getChildAt(s.numChildren-1) as TextSprite;// get the text sprite belonging to this node sprite
    var b:Rectangle = s2.getBounds(s);
    return s2.width;
}
function getTextLabelHeight(s:NodeSprite):Number {
    var s2:TextSprite = s.getChildAt(s.numChildren-1) as TextSprite;// get the text sprite belonging to this node sprite
    var b:Rectangle = s2.getBounds(s);
    return s2.height;
}
function adjustLabel(s:NodeSprite, w:Number, h:Number):void {

    var s2:TextSprite = s.getChildAt(s.numChildren-1) as TextSprite;// get the text sprite belonging to this node sprite

    s2.horizontalAnchor = TextSprite.CENTER;
    s2.verticalAnchor = TextSprite.CENTER;

}

GraphMLFileDemo();

yeah, that's boring.. but easy:
you need to place IMXMLObject.as inside a directory mx/core at the same level of your fla.

eg:
/my.fla
/mx/core/IMXMLObject.as

as i've said before, if there's a need to import other classes from flex, try to search for the as file over google.
dont forget to place it at the rigth package.

IMXMLObject.as

////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2003-2006 Adobe Macromedia Software LLC and its licensors.
//  All Rights Reserved. The following is Source Code and is subject to all
//  restrictions on such code as contained in the End User License Agreement
//  accompanying this product.
//
////////////////////////////////////////////////////////////////////////////////

package mx.core
{

/**
*  The IMXMLObject interface defines the APIs that a non-visual component
*  must implement in order to work properly with the MXML compiler.
*  Currently, the only supported method is the <code>initialized()</code>
*  method.
*/
public interface IMXMLObject
{
    //--------------------------------------------------------------------------
    //
    //  Methods
    //
    //--------------------------------------------------------------------------

    /**
     *  Called after the implementing object has been created and all
     *  component properties specified on the MXML tag have been initialized.
     *
     *  @param document The MXML document that created this object.
     *
     *  @param id The identifier used by <code>document</code> to refer
     *  to this object.
     *  If the object is a deep property on <code>document</code>,
     *  <code>id</code> is null.
     */
    function initialized(document:Object, id:String):void;
}

}