/// <summary>Set this avatar's tier contribution</summary>
/// <param name="group">Group ID to change tier in</param>
/// <param name="contribution">amount of tier to donate</param>
public void SetGroupContribution(UUID group, int contribution)
{
SetGroupContributionPacket sgp = new SetGroupContributionPacket();
sgp.AgentData.AgentID = Client.self.getAgentID();
sgp.AgentData.SessionID = Client.self.getSessionID();
sgp.Data.GroupID = group;
sgp.Data.Contribution = contribution;