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FIX. RadTreeView - ToggleStateTypeConverter should handle converting from/to System.Windows.Forms.CheckState as well

To reproduce:

public RadForm1()
{
InitializeComponent();

BindingList<Item> items = new BindingList<Item>();
items.Add(new Item(0,"Root", CheckState.Checked,-1));
for (int i = 1; i < 5; i++)
{
items.Add(new Item(i, "Node" + i, CheckState.Checked,0));
}

this.radTreeView1.CheckBoxes = true;
this.radTreeView1.DisplayMember = "Name";
this.radTreeView1.ChildMember = "Id";
this.radTreeView1.ParentMember = "ParentId";
this.radTreeView1.CheckedMember = "IsActive";
this.radTreeView1.AutoCheckChildNodes = true;
this.radTreeView1.TriStateMode = true;
this.radTreeView1.DataSource = items;
this.radTreeView1.ExpandAll();
}

public class Item
{
public int Id { get; set; }

public string Name { get; set; }

public CheckState IsActive { get; set; }

public int ParentId { get; set; }

public Item(int id, string name, CheckState isActive, int parentId)
{
this.Id = id;
this.Name = name;
this.IsActive = isActive;
this.ParentId = parentId;
}
}

Workaround: implement a TypeConverter that can handle converting from/to System.Windows.Forms.CheckState. A sample implementation for creating a custom TypeConverter is demonstrated in the following help article: https://docs.telerik.com/devtools/winforms/treeview/data-binding/togglestateconverter
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