Unable to check / uncheck a checkbox in a JTable...

Hi all,
I know that a lot of people have asked this question before but I am unable to find a solution even after going all the messages. My issue is:
My initial rendering of the checkboxes inside the table works ok. I am using a TableCellRenderer and my input to determine the "checked/unchecked" is string like "true" or "false" and not boolean values. But I am unable to do check / uncheck any of the checkboxes.
I would really appreciate any pointers.
Thanks in advance.
Below is my code snippet:
public Component getTableCellRendererComponent(JTable table_,
Object value_, boolean isSelected_, boolean hasFocus_, int rowIndex_,
int colIndex_)
Component component = super.getTableCellRendererComponent(table_,
value_, isSelected_, hasFocus_, rowIndex_, colIndex_);
indicator = table_.getColumnModel().getColumnIndex("IND");
if (indicator == colIndex_)
     if (value_.equals("true")){
          component = new JCheckBox("", true);
     } else {
          component = new JCheckBox("", false);
     return component;
}

Your TableModel has to indicate that the column is editable. Your TableModel also has to implement setValueAt() so that when the user changes the value, it updates the data.
The table will know to use it's own boolean renderer/editor for that column because it knows what to do when a column returns a Boolean.

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