Windows: Adding tiles to a folder in the start menu (problem)

In the windows start menu you can group multiple tiles under one tile. Just drag one tile over another one and they are both grouped under a folder tile:

Only... it doesn't work with small tiles. Most of the time windows swaps the tiles rather than adding the tile you're dragging in the folder.
Stupid solution for a stupid bug:

1. Resize the tile you are dragging to to medium size. 
2. Drag the tile you want to add into it
3. Resize the folder tile to small again.