Addon not work in 2007

The add-on was developed in the beginning for the version 7.6,

upgraded to version 2004C and now should be upgraded to version 2007.

It runs without errors on version 2004C.

The main functionality which doesnt work is the 'Munkalap' (worksheet in

english) an interface to create, display and modify worksheets in the system.

I have changed the DI and UI to the newest version. The new menu items are apperad, But after starting this functionality in the add-on, the new form is apperad in a search mode, but I can' search for a worksheet and i can't save and I can't add any new worksheet

The addon's other functionality, is work, which is make a txt file.

Can anyone help one, what can be the problem?