private void okButton_Click(object sender, EventArgs e)
{
Group group = new Group(groupTextBox.Text.ToString());
dash.addGroup(group);
Close();
dash.populateGroupsComboBox();
}
public void addGroup(Group theGroup)
{
if (groups.ContainsKey(theGroup.name) == false)
groups.Add(theGroup.name, theGroup.usersInGroup);
else
MessageBox.Show("A group already exists with this name.");
}