As a workaround you can apply the style explicitly or through an ItemContainerStyleSelector.
RadTileList: Memory leak when removing items from the collection of ItemsSource of the RadTileList and then change any property of any of the removed items. Available in LIB version: 2017.2.605
The fix will be released with Q1 2016 offical version.
The problem should be resolved with lib version 2015.3.1026.
The fix will be available with Q2 2015.
Should be resolved with lib version 2014.3.1402.
Should be resolved with lib version 2014.3.1124
This issue will be resolved with Q3 2014 expected till the end of the month.
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.
This problem will be resolved in WPF with Q3 2014 expected till the end of the month.