EditorUtility.CollectDependencies  

static function CollectDependencies (roots : Object[]) : Object[]

Description

Calculates and returns a list of all assets the assets listed in roots depend on.

Editor window that shows the next example.

//Select the dependencies of the found GameObject

class EditorGUIObjectField extends EditorWindow {

    var obj : GameObject = null;

    @MenuItem("Examples/Select Dependencies")
    static function Init() {
        var window = GetWindow(EditorGUIObjectField);
        window.position = Rect(0, 0, 250, 80);
        window.Show();
    }

    function OnInspectorUpdate() {
        Repaint();
    }

    function OnGUI() {
        obj = EditorGUI.ObjectField(Rect(3,3,position.width - 6, 20),
                "Find Dependency",
                obj,
                GameObject);

        if(obj)    {
            if(GUI.Button(Rect(3,25,position.width - 6, 20), "Check Dependencies"))
                Selection.objects = EditorUtility.CollectDependencies([obj]);
        } else {
            EditorGUI.LabelField(Rect(3,25,position.width - 6,20),
                "Missing:",
                "Select an object first");
        }
    }
}