Color pallet setting in X6

In X3 I was able to add colors to the default CMYK pallet using the Pallet Editor. I've been unable to do this in X6. To work around this, I've been creating document pallets for each project, but they don't save when I shut down the program. When I open it back up I need to drag colors back to the pallet. Is there a setting I can change that will enable me to add colors to the CMYK pallet and have them stay there?