problem with checkbox column

Checkbox column is duplicated everytime it is loaded in second attempt, other grid on the same context also adding its checkbox column. Here's the scenario, all grids are inside jquery ui tab. Each tab panel is generated from template (not remote tab). The 'grid columns' (not sure if this is the cause) inside the first tab was populated dynamically. When an action is clicked inside the grid in the 1st tab, 2nd tab will be generated with its grid. On first load, it is fine, but after i closed the 2nd tab and generate it again, all checkbox column on each grid are incremented. Please help

Reproduce the scenario with grids inside jQuery UI tabs and panels generated from templates, especially closing and regenerating the second tab. Start by tracing grid-column loading and checkbox-column initialization across both grids. Done means reopening the second tab no longer adds duplicate checkbox columns to either grid.

Written by the indexing model from the issue text.