EXTJS GridPanel Selection Model

I have a GridPanel, when i am binding the GridPanel from database, bydefault some rows should be selected. how can i do this. can u please he开发者_如何学JAVAlp me.

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try this

Ext.getCmp('grid').getSelectionModel().selectRow(RowIndex);

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var grid = Ext.ComponentQuery.query('NameOfYourGridAlias');
grid[0].getSelectionModel().select(RowIndex);