static/ext/src/util/AbstractMixedCollection.js
function() {
        if (Ext.isDefined(Ext.global.console)) {
            Ext.global.console.warn('Ext.util.MixedCollection: find has been deprecated. Use findBy instead.');
        }
        return this.findBy.apply(this, arguments);
    }
function() {
        if (Ext.isDefined(Ext.global.console)) {
            Ext.global.console.warn('Ext.util.MixedCollection: find has been deprecated. Use findBy instead.');
        }
        return this.findBy.apply(this, arguments);
    }
<deprecated since="0.99"> 
Returns the first item in the collection which elicits a true return value from the passed selection function.
@deprecated 4.0 Use {@link #findBy} instead.
@since Ext 1