- "desc" : "The function a {@link Roo.dd.DragSource} calls continuously while it is being dragged over the target.\nThis method will be called on every mouse movement while the drag source is over the drop target.\nThis default implementation simply returns the dropAllowed config value.\n\nIMPORTANT : it should set this.dropAllowed",
+ "desc" : "The function a {@link Roo.dd.DragSource} calls continuously while it is being dragged over the target.\nThis method will be called on every mouse movement while the drag source is over the drop target.\nThis default implementation simply returns the dropAllowed config value.\n\nIMPORTANT : it should set this.valid to true|false",