make stone tiles indestructible?

does anybody know how to make stone backgrounds and blocks indestructible?

I tried editing StoneStructureHit.as but it seems that's for blobs and not tiles.

 

Code:

TileType server_onTileHit(CMap@ map, f32 damage, u32 index, TileType oldTileType)
{
    switch(oldTileType)
    {
        case CMap::tile_castle:
        case CMap::tile_castle_back:
        {
            return oldTileType;
        }
    }
}

didnt tested, but this should work, put it in LoaderUtilities.as

 

@makmoud98 the bomb thing was the whole point though bombs destroy the stone tiles which I don't want.
making bombs not destroy tiles is bad because I want them to be able to destroy wood
@GoldenGuy is TileType a return type?
I'm getting a "not all paths return a value"
I suspect its because I'm opt returning anything so I did this..

Code:

TileType server_onTileHit(CMap@ map, f32 damage, u32 index, TileType oldTileType)
{
    switch(oldTileType)
    {
        case CMap::tile_castle:
        {
            return oldTileType;
        }
        case CMap::tile_castle_back:
        {
            return oldTileType;
        }
    }
    return oldTileType;
}

however when I put that last return statement it allows the map to load but the tiles are still destructable

@GoldenGuy you there? I need some help with your code it doesn't make these tiles indestructable.