After page is loaded a new behavior is available to the grid veiw (in this case the plug-in simply recalculates values for row cells upon user input).
The problem may arise when the GridView control is inside an UpdatePanel and an sync postback occurs. In this case the old table is deleted and new markup is rendered in it's place. This means that old DOM elements are deleted and no active event subscriptions exist anymore. After postback plug-in behavior is not active and should be reattached once again. To this MS Ajax client library can be used to handle async postback event when reposnse is received and rendered:
Note: if the init script creates any DOM elements outside the update panel then duplicate elements can be created after async postbacks. This should be handled separately.