Ext.require('Ext.grid.plugin.CellEditing');

function MyEditableGrid({ store }) {
    return (
        <Grid
            store={store}
            plugins={{ptype: 'cellediting', clicksToEdit: 1}}
            columns={[
                { text: 'Name', dataIndex: 'name', flex: 1, editor: 'textfield' },
                ...
            ]}
        />
    )
}