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    <p>Another possibility is to create a subclass of GridPanel. The constructor of this subclass can examine its given config for a PagingToolbar config. If one is present, instantiate the store (if needed) and give a reference to it to the PagingToolbar config.</p> <pre><code>var MyGridPanel = Ext.extend(Ext.grid.GridPanel, { constructor: function( cfg ) { if ( cfg &amp;&amp; cfg.store &amp;&amp; cfg.bbar &amp;&amp; cfg.bbar.xtype == 'paging' &amp;&amp; ! (cfg.bbar instanceof Ext.PagingToolbar &amp;&amp; ! this.bbar.store ) { if ( cfg.store.xtype &amp;&amp; ! (cfg.store instanceof Ext.data.Store) ) { cfg.store = Ext.ComponentMgr.create(cfg.store); } cfg.bbar.store = cfg.store; } MyGridPanel.superclass.constructor.call(this, cfg); } }); </code></pre> <p>Example usage:</p> <pre><code>(new Ext.Window({ width: 400, height: 200, layout: 'fit', items: new MyGridPanel({ store: { xtype: 'arraystore', fields: ['name', 'value'], data: [ ['name 1', 'value 1'], ['name 2', 'value 2'] ] }, columns: [ { dataIndex: 'name', header: 'Name' }, { dataIndex: 'value', header: 'Value' } ], bbar: { xtype: 'paging', pageSize: 25 } }) })).show(); </code></pre> <p>Another option is to use createInterceptor to apply the above behavior to the GridPanel directly:</p> <pre><code>Ext.grid.GridPanel.prototype.initComponent = Ext.grid.GridPanel.prototype.initComponent.createInterceptor(function() { if ( this.store &amp;&amp; this.bbar &amp;&amp; this.bbar.xtype == 'paging' &amp;&amp; ! (this.bbar instanceof Ext.PagingToolbar) &amp;&amp; ! this.bbar.store ) { if ( this.store.xtype &amp;&amp; ! (this.store instanceof Ext.data.Store) ) { this.store = Ext.ComponentMgr.create(this.store); } this.bbar.store = this.store; } }); </code></pre> <p>This would allow you to continue using xtype: 'grid'.</p>
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    1. COThank you Owlness for your example, It also might be a solution for my application. Is there any way I can overwrite default grid configuration to add extra validation for bottom toolbar.
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      1. USNazariy
    2. COJust had the biggest DOH!!! moment. I didn't realise you can put `constructor` as a function inside the object passed to `Ext.extend`. But of course it makes sense - constructor is just a function on the prototype and that's where all those functions go. All this time I have been defining the constructor as a function and then extending it. This way the code is much cleaner.
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    3. COWhat sort of extra validation are you asking about, Nazariy? Any manner of manipulation you would expect to be able to do to the config object can be performed in the constructor of the above example. More advanced modifications can also be applied through overriding of other methods or adding event listeners.
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