That's how I created banded rows. Bit of a hack, but relatively simple, and someone might find an even easier way to achieve that.
I am attaching a screenshot of the final result and the repeater conditions, plus the .rp file.
The repeated item contains a grey rectangle in the background, set to hidden by default.
I've added one special "#" character at the beginning of the value in the first column, one every two lines.
Then I set a condition so that if the item that contains the character "#", then a substring is displayed instead of the normal value: [[item.Name.substring(1)]]
If the character "#" is not there, then the normal value is displayed: [[item.Name]], and the grey rectangle is made visible.
This way I could potentially control the way I want to format each item in the repeater, when certain conditions are met, based on the values specified in the repeater items. I haven't played with filtering and sorting yet, but I guess the limitation of this approach is that when the items are sorted differently or filtered out, then it would not work in all situations, and a different approach should be used. Would be nice to have an easy way to do it.
Note: the line at the bottom of the repeated item is a rectangle made 1 pixel high. Using a normal line would leave a few pixels of undesired padding in between the repeated items. RepeaterBandedRows .rp