check drag relase over

[tito100]

Hi enyone
Im new usser in Gwt . Can somebady help me.
I have class

public class FileBin extends VStack{
	public FileBin(){
		super();
		fileTypes=FileTypes.allTypes();
		setShowEdges(true); 
		setEdgeImage("edges/blue/5.png");
		setDefaultHeight(200);
		setCanAcceptDrop(true); 
	}
}
public class Icon extends Img {
	public Icon(){
        setWidth(48);  
        setHeight(48);  
        setLayoutAlign(Alignment.CENTER);  
        setCanDragReposition(true);  
        setCanDrop(true);  
        setDragAppearance(DragAppearance.TARGET);  
        setAppImgDir("icons/48/");  
        setSrc("star_grey.png"); 
	}

I want to capture the event when the mouse is over FileBin , and button is relased.
Now icon is automatically added to FileBin . This I do not want. I need to put it there manually. How I can do this ?

Thanks

[svjard]

Canvas.addDropHandler()