lib/Ext/picker/Picker.js
function(newSlots) {
        var bcss = Ext.baseCSSPrefix,
            innerItems;

        this.removeAll();

        if (newSlots) {
            this.add(newSlots);
        }

        innerItems = this.getInnerItems();
        if (innerItems.length > 0) {
            innerItems[0].addCls(bcss + 'first');
            innerItems[innerItems.length - 1].addCls(bcss + 'last');
        }

        this.updateUseTitles(this.getUseTitles());
    }
function(newSlots) {
        var bcss = Ext.baseCSSPrefix,
            innerItems;

        this.removeAll();

        if (newSlots) {
            this.add(newSlots);
        }

        innerItems = this.getInnerItems();
        if (innerItems.length > 0) {
            innerItems[0].addCls(bcss + 'first');
            innerItems[innerItems.length - 1].addCls(bcss + 'last');
        }

        this.updateUseTitles(this.getUseTitles());
    }
Adds any new {@link #slots} to this picker, and removes existing {@link #slots}
@private