partitioning - how to extend main partition with gparted live cd

I booted with gparted and it shows my main partition and an extended, wiht linux-swap inside(I do not know what this is) and I have about 17.00 GB of free space on a new partition but I cant seem to merge. When I click on the main partition and put resize it does not give me any options to merge, resize, etc.

update

First, you need to delete the partition (New Partition #1)
Then you will be able to resize sda1