Ext.form.field.ComboBox 切换store没有反应

遇到这种情况建议使用下面这个方法，可以有效避免上面的问题

bindStore( [Ext.data.AbstractStore/String store],
[Boolean initial] )

Binds a store to this instance.

Parameters

store : Ext.data.AbstractStore/String (optional)

The store to bind or ID of the store. When no store given (or when

null

or

undefined

passed),
unbinds the existing store.

initial : Boolean (optional)

True to not remove listeners from existing store.

Defaults to:

false