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handling #master_checkbox

hi,
I am using a master_checkbox in my grid.

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mygrid.setHeader("#master_checkbox",.........)


Suppose I want all the row Ids (for some purpose) after selecting that chkbox. How can i do this?
If it is not possible by Master checkbox , kindly tell me an alternative to do this with checkbox.

Plz mind that I hav 3 header under this grid & each header have its own childrens & a chkbox
to select all the childs under that header.For this i hav already handling an event .

You can get id's of the rows with checked checboxes using method getCheckedRows(col_ind) where col_ind - column index. This method returns comma delimited list of Ids of all rows with checked exCell in specified column.