private void instancesList_SelectedIndexChanged(object sender, EventArgs e)
{
if (instancesList.SelectedIndex == -1) return;
showButton.Enabled = true;
hideButton.Enabled = true;
stopButton.Enabled = true;
string selItem = instancesList.SelectedItem as string;
int pid = int.Parse(selItem.Split(']')[0].Substring(1));
curMiner = miners.Find(x => x.pid == pid);
priorityDropdown.Enabled = true;
priorityDropdown.SelectedIndex = curMiner.priority;
}