Filter table search boxes getting disabled

Hi everyone,

I am trying to use Filter Table addon and PagedTable addon for a particular table.
I am creating a class like this:
public class FilterAndPagedTable extends FilterTable {

// contains all the methods of PagedTable class

public class DemoTable extends Application {
public void init() {
Window mainWindow = new Window(“Home Page”);
FilterAndPagedTable table = new FilterAndPagedTable();

Issue is : Search boxes for filtering are getting disabled.
Pagination is working fine.

Any suggestions, whats going wrong, why Filter search boxes being disabled.

Thanx in Advance.