regarding Collapsible Data Grid Plugin With jQuery - Treegrid

regarding Collapsible Data Grid Plugin With jQuery - Treegrid

I am using this plugin.Its working fine. But sometimes the node which it creates does not expand. I did a debug of jquery.grid.js . And found out that _expanderClick() function is getting called multiple times in the cases when node doen't expand. 
Although the html for tr and child tr are getting loaded fully.

Can anyone help me with this issue.