Hi Javier,
The RadTileView measures with infinity, so it does the RadPanelBarItem too. So you need to set some kind of limitations on the RadTileView like MaxHeight and MaxWidth, Height and width, MinimizedRowHeight, MInimizedColumnWidth. You can check out this forum post. Hope you will find it useful too.
All the best,
Petar Mladenov
the Telerik team
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