extjs3 - extjs customise number of rows to display in Ext.grid.ColumnModel -

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how should customize change how many rows of columnmodel table gets displayed in web app before table scrolls

new ext.panel({     items : [{         xtype : 'panel',         id : 'abc',         height : 250,         autoscroll : false,         frame : false,         items : [{             xtype : 'editorgrid',             id : 'abc-grid',             store : abc.store,             cm : abc.col,             sm : new ext.grid.rowselectionmodel(),             height : 100,             frame : false,             clickstoedit : 2,             striperows : true,             view: gridview,             viewconfig : {                 headersdisabled : true             },             listeners : {             }         }]     }] });


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