void _engine_PluginAdded(object sender, Framework.EventArguments.PluginEventArgs e)
{
if (e.Plugin is Framework.Interfaces.IPluginUIMainWindow)
{
e.Plugin.Closing += new Framework.EventArguments.PluginEventHandler(Plugin_Closing);
}
}
void Plugin_Closing(object sender, Framework.EventArguments.PluginEventArgs e)
{
_engine.PluginAdded -= new Framework.EventArguments.PluginEventHandler(_engine_PluginAdded);
List <Framework.Interfaces.IPlugin> p = _engine.GetPlugin(Framework.PluginType.UIMainWindow);
if (p == null || p.Count == 0 || (p.Count == 1 && p[0] == e.Plugin))
{
Close();
}
}