formPanel中一个numberfield，我在通过this能得到numberfield，即this指向的就是这个numberfield，
我怎样通过numberfield得到它的父控件formPanel？
因为我想操作fromPanel中其他的字段。
如果你的numberfield不是直接放在formpanel的,如嵌套了fieldset
那就用下面的2种方法:
[b]findParentBy/b : Ext.Container
Find a container above this component at any level by a custom function. If the passed function returns true, the container will be returned.
Parameters:
fn : Function
The custom function to call with the arguments (container, this component).
Returns:
Ext.Container
The first Container for which the custom function returns true
Component
[b]findParentByType/b : Ext.Container
Find a container above this component at any level by xtype or class
Parameters:
xtype : String/Class
The xtype string for a component, or the class of the component directly
Returns:
Ext.Container
The first Container which matches the given xtype or class
numberfield.ownerCt
ownerCt : Ext.Container
The component's owner Ext.Container (defaults to undefined, and is set automatically when the component is added to a container). Read-only.
Note: to access items within the container see itemId.
Component