/// from being sent until session is rejoined.
/// </summary>
/// <param name="groupID"><seealso cref="UUID"/> of Group chat session to leave</param>
public void RequestLeaveGroupChat(UUID groupID)
{
ImprovedInstantMessagePacket im = new ImprovedInstantMessagePacket();
im.AgentData.AgentID = Client.self.getAgentID();
im.AgentData.SessionID = Client.self.getSessionID();
im.MessageBlock.Dialog = (byte)InstantMessageDialog.SessionDrop.getIndex();
im.MessageBlock.FromAgentName = Utils.stringToBytesWithTrailingNullByte(Client.self.getName());