public class SupportApplications: object
{
	public string Name { get; set; } = "{Please Set}";
	public ExecutionTime ExecutionTime { get; set; } = ExecutionTime.BeforeLaunch;
	public ExecutionMode ExecutionMode { get; set; } = ExecutionMode.Exclusive;
}

public class ComputerVM : BaseVM
{
	[Editor(typeof(GenericCollectionEditor), typeof(UITypeEditor))]
	public List<SupportApplications> SupportApplications
	{ get { return Computer.BigBoxSupportApplications; } set { Computer.BigBoxSupportApplications = value; OnPropertyChanged(); } }
}

internal class GenericCollectionEditor : UITypeEditor
{
	public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
	{
		if (context == null && context.Instance == null) return base.GetEditStyle(context);
		return UITypeEditorEditStyle.Modal;
	}

	public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
	{
		if (context == null || provider == null || context.Instance == null) return value;

		IWindowsFormsEditorService editorService = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

		Type type = value.GetType().GetGenericArguments().SingleOrDefault() ?? typeof(object);

		GenericCollectionEditorForm form = new GenericCollectionEditorForm((List<object>)value, type);

		if (editorService.ShowDialog(form) == System.Windows.Forms.DialogResult.OK)
		{
			return form.Objects.ToList();
		}

		return base.EditValue(context, provider, value);
	}
}

public partial class GenericCollectionEditorForm : FormViewBase
{
	public List<object> Objects { get; set; }

	private Type type = null;

	private BindingSource objectsBindingSource = new BindingSource();

    public GenericCollectionEditorForm(List<object> objects, Type type)
	{
		Objects = objects;
		this.type = type;

		objectsBindingSource.DataSource = Objects;
		MainLB.DataSource = objectsBindingSource;
	}

	private void AddBT_Click(object sender, EventArgs e)
	{
		if (type == null) return;
		Objects.Add(type);
		RefreshEffectListDataBindings();
	}

	private void MainLB_SelectedValueChanged(object sender, EventArgs e)
	{
		MainPG.SelectedObject = MainLB.SelectedItem;
	}

	private void RefreshEffectListDataBindings()
	{
		MainLB.DataSource = null;
		MainLB.DataSource = objectsBindingSource;
	}

	private void DeleteBT_Click(object sender, EventArgs e)
	{
		if (MainLB.SelectedItems.Count == 0) return;
		Objects.Remove(objectsBindingSource.Current);
		RefreshEffectListDataBindings();
	}
}