how can i add checkbox in a column header? ext js

I have a grid, with dynamically ch开发者_StackOverflow社区anging number of columns. I've already got column with checkboxes. I need to add a checkBox to other columns headers, only to headers.

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Yes. Include the Ext.grid.CheckboxSelectionModel as a column when declaring your ColumnModel.

var colModel = new Ext.grid.ColumnModel({
    columns: [ new Ext.grid.CheckboxSelectionModel(),
    {/* other columns}]
});