Anyone know where is the TreeNode "reload " or similar in extjs 4?

/**
* Trigger a reload for this node
* @param {Function} callback
* @param {Object} scope (optional) The scope (<code>this</code> reference) in which the callback is executed. Defaults to this Node. */
reload : function(callback, scope){
this.collapse(false, false);
while(this.firstChild){
this.removeChild(this.firstChild).destroy();
}
this.childrenRendered = false;
this.loaded = false;
if(this.isHiddenRoot()){
this.expanded = false;
}
this.expand(false, false, callback, scope);
}


Thanks in advance,

Claudio