The fix will be available with Q2 2015. 

The fix will be released with Q1 2016 offical version.

The problem should be resolved with lib version 2015.3.1026.

Should be resolved with lib version 2014.3.1402.

Should be resolved with lib version 2014.3.1124

This feature is available with Q1 2016. 

I use RadTileList without any tiles grouping. But internally TileListPanel get top padding 30 px. So visually I got "hole" above the list. And i can't set margin -30 because i can't be sure about this padding. 
ItemsPanelTemplate with padding="0" don't work properly as described at http://stackoverflow.com/questions/23091182/layout-issue-with-telerik-radtilelist-control.
I tnink that this top padding should be 0 px if there are no groups at tiles or no "TileGroup" elements are specified.

Should be resolved with Q3 2014 expected till the end of October. 

This issue will be resolved with Q3 2014 expected till the end of the month. 

This problem will be resolved in WPF with Q3 2014 expected till the end of the month.