// text box
private void attach(string key, TextBox txt)
{
txt.TextChanged -= txtChanged;
txt.Text = "";
if (p == null)
{
return;
}
var v = p.Get(new Key(key, log), log);
txt.Tag = v;
if (v.IsSet)
{
txt.Text = (string)v.Value;
}
if (v.Readonly)
{
txt.Tag = null;
}
else
{
txt.TextChanged += txtChanged;
}
}