Ok i guess it isn't possible on the grid then and i will have to do it in the underlaying businessentity, dataset or whatever

Thanks for the information

I'm afraid I still do not understand what you are asking. I can clearly see in the screen shot here that you have filter rows displayed in both the parent band and the child band. I do not see any parent rows here that have multiple child bands.

ArcodenOuden said:

I wan't to filter on the child bands

You can filter child bands using the ColumnFilters collection of the band, or the user could type into the filter row.

ArcodenOuden said:

or else i want each main band expanded & duplicated whenever there are 2 child bands under 1 main band.

 I don't understand this statement. I don't see any rows here that have sibling bands. But if there were rows with 2 child bands under them, then there is no way the grid can duplicate the parent row to show one child band under each. This would have to be done by the data source, not the grid. 

PS: I didn't get an usefull answer yet (but the topic is marked as answer?)

As example an test grid with test data.

Each main band (customers) has 1 or 2 child bands (adresses)

I wan't to filter on the child bands or else i want each main band expanded & duplicated whenever there are 2 child bands under 1 main band.

Maybe an unbound column in the main band?

I don't understand what you mean. SortIndicator is on the column, not the band. And it is available on any column on any band, it makes no difference if it's a child band or the root band.

The same is true for filtering. You can use ColumnFilters to filter on any band.