bool makePixelPerfect = EditorGUILayout.Toggle ("Make Pixel Perfect",anim.makePixelPerfect);
if (anim.makePixelPerfect != makePixelPerfect)
{
NGUIEditorTools.RegisterUndo("Sprite Animation Change", anim);
anim.makePixelPerfect = makePixelPerfect;
EditorUtility.SetDirty(anim);
}