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master_checkbox

I am trying to use master_checkbox for main header..and the code which i am using is
"mygrid.setHeader("Id,Book,Price,#master_Checkbox")";
but still i am not able to use it...its just printing #master_checkbox in the grid and that too without image.

Kindly give me the solution.
provide me some code so that i can use #master_checkbox , i am using professional DHX.

To use #master_checkbox you have to include file dhtmlxgrid_filter.js from the folder dhtmlxGrid\codebase\ext\