How to select checkcolumn cells in a row when CheckboxModel column is selected

[ilawai]

Hi,
I am new user of Extjs 4.1.1 version.
My grid panel includes the following:
selModel : Ext.create('Ext.selection.CheckboxModel'
and several checkcolumns.
I cant find a good solution to the following problems:
I would like to select/deselect all cells in a row of type checkcolumns, when a user selects/deselects a checkbox in a CheckboxModel column of that row.

Another question:
How to add a checkbox to a column header of type checkcolumn, and when it selected/deselected to select\deselect all cells in this column.

in addition i would like to mark all changes cell as dirty and update them later in the DB (after user would press update all).

[mitchellsimoens]

Listen to the select event and set the value of that column's dataIndex to true so it's checked