void OnUiResizeEnd(object sender, EventArgs e)
 {
     if (currentManagerConfig != null)
     {
         currentManagerConfig.LastUiSize = Size;
         currentManagerConfig.SaveTo();
     }
 }
        /// <summary>
        /// Load the collection represented by the given file
        /// also sets collection variable.
        /// </summary>
        /// <param name="path">the path of the collection to open</param>
        void LoadCollection(string path)
        {
            //check that path is valid
            if (string.IsNullOrWhiteSpace(path))
            {
                return;
            }

            //check if collection file already exists
            if (File.Exists(path))
            {
                currentCollection = PadoruCollection.FromFile(path);
            }
            else
            {
                //collection file does not exist, create it?
                if (MessageBox.Show(this, $"The Collection at \"{path}\" does not exist!\nDo you want to create a new Collection?", "Create Collection", MessageBoxButtons.YesNo) != DialogResult.Yes)
                {
                    return;
                }

                //create empty collection
                currentCollection            = PadoruCollection.CreateEmpty();
                currentCollection.LoadedFrom = path;
            }

            //check if collection config file already exists
            string collectionConfig = Path.Combine(Path.GetDirectoryName(path), COLLECTION_MANAGER_CONFIG_NAME);

            if (File.Exists(collectionConfig))
            {
                //exists, load it
                currentManagerConfig = CollectionManagerConfig.LoadFrom(collectionConfig);
            }
            else
            {
                //does not exists, open setup wizard
                ManagerConfigSetupWizard wizard = new ManagerConfigSetupWizard();

                //have to enter a config to continue
                while (wizard.ShowDialog() != DialogResult.OK)
                {
                    ;
                }

                //get configuration from wizard
                currentManagerConfig = wizard.ResultingConfig;

                //save config
                currentManagerConfig.LoadedFrom = collectionConfig;
                currentManagerConfig.SaveTo();
            }

            //set window title
            Text = $"Collection Manager - {Path.GetFileName(currentCollection.LoadedFrom)}";
        }