ShowParticipantsEnabledState()
{
AssertValid();
// The DataGridView doesn't look disabled when it's disabled. Work
// around that.
dgvParticipants.ForeColor =
dgvParticipants.ColumnHeadersDefaultCellStyle.ForeColor =
dgvParticipants.Enabled ?
SystemColors.ControlText : SystemColors.GrayText;
}