Tile Map Set Tile doesn't work

Setting a tile map’s tile doesn’t currently work in Unreal 4.15. I’ve setup a Paper Tile Map and then want to change the tile to a different Index inside a Tile Sheet. It doesn’t work at all for some reason. I verified that it doesn’t work on a new project as well.

Please look at the picture for repro steps.

I was able to create a instance of the tile map inside the level blueprint in order to modify the tiles dynamically. This cannot be done in blueprints tho unfortunately.

i found a solution, all you have to do is run the function “Make Tile Map Editable” before you try to set the tiles.
i’m doing this in the level blueprint though, not sure if it works in other ones yet with permissions 'n all, but i know it works there.