I have netbeans 7.0 for PHP. 
I use tabs for indention for all files with size 4 chars. In php files it is ok, but in yaml (*.yml) files not. There are two problems:

 1. tabs size is 2 spaces (despite of I have set it 4 for all files)
 2. if I write some row (which is indented) and then press ENTER, the next row is indented but with spaces (not with tabs). In PHP files is it ok, this problem is only in yaml files.