[yj589794]

This link should be useful:
http://wowprogramming.com/docs/secur.../Group_Headers

The nameList filter should be passed as parameters when you spawn your header frames.

e.g.

local header = self:SpawnHeader(nil, nil, 'party,raid',
				'showPlayer', true,
				'showParty', true,
				'showRaid', true,
				'nameList', 'ToonA,ToonB,ToonC',
				'initial-width', 100,
				'initial-height', 25,
				'oUF-initialConfigFunction', [[
					local header = self:GetParent()
					self:SetWidth(header:GetAttribute('initial-width'))
					self:SetHeight(header:GetAttribute('initial-height'))
				]]
)