Product Update (3-15-2007)
The search capability mentioned in #3 is not applicable to the Advanced Filter option for Combo Box and Link widgets.
The ability to do case-insensitive filtering on these widgets is a feature that we are considering for future inclusion to the product.
Thanks for posting this question, Lblaivas.
Leonid --
Please use Text Search. In Text Search, you can also search for a particular field by using the "Data Field:value" syntax, where the Data Field is NOT the full xpath but the leaf Data Field name. For example, "Name:smith". This will find all instances of Smith, smith, sMith, SMith, etc., in the Name field.
Click on the GO button to launch the Text Search (hitting the Enter key in your keyboard will do the same).
Hope this helps.
The focus of this release was primarily to fine tune existing features in both user and author modes.