I want a progress bar displayed in a tree table. Basically I want a set of rules to be displayed in a tree table with the progress bar determing by how much the rule is violated. Secondly each rule is associated with a ruleset whose progress is determined by the number of rules that have succeded. These have to be displayed in the tree table.
How do I display the progress bar widget in the tree table column?

This is because it only returns a String in the render() method of the TreeTableColumn.
Any help would be appreciated.