I have a listview of which itemsource is set to my custom collection, let's say MyCollection. The code below is not full code , it's just a code snippets to explain the problem.

class Item : INotifyPropertyChanged
{
   Options _options;
   public Options OptionProp
   {
        get { return _options; }
        set { _options = value; OnPropertyChanged ("OptionProp");}
   }

   string _Name;

   public string NameProp
   {
        get { return _Name; }
        set { _Name = value; OnPropertyChanged ("NameProp");}
   }
 }

class Options : Dictionary<string,string>
{
     public Options()
    {
        this.Clear();
        this.Add("One" , "1" );
        this.Add("Two" , "2" );
        this.Add("Three" , "3" );
     }

  }

MyCollection in my viewModel

class viewModel
{

      ObservableCollection<Item> **MyCollection**;
      KeyValuePair<sting,string> **SelectedOption**;
}

The listview Item Source is set to my MyCollection.

<ListView ItemSource = MyCollectoin>

I Listview contains two columns of which I have defined a datatemplats in the listview.

1. First column is a combo-box of which Itemsource is set to Options ( defined above )
2. Second column is a simple textblock to display Name.

Problem 1. I have defined a datatemplate for first column in which I have a combo box , I have set the

Itemsource =**MyCollection**

and SelectedItem = SelectedOption

of the combo-box.

User can perform following operations in the listview:

1. Add ( Add the row in the listview )
2. Move Up ( Move row up in the listview )
3. Move Down ( Move down the item in the listview )

.Now when I add the row in the listview , the combo-box selected index is always comes to -1 (first column). However the combo box contains options One, Two and Three. Also, I have initialized the SelectedOption to contain the first item, i:e One.

problem 2. . Let suppose, I have added a single row in a listview and I have selected Option "one" in the combo box manually. Now when I perform Move Up or Move Down operations the selected index of a combo box is again set to -1. In the Move Up or Move Down operation , I am calling MoveUp and MoveDown methods of the Observable collection.

Probelm 3

How to serialize the entire collection in XML. Since I can't serialize the Dictionary and KeyValue Pair.

I have to restore the state of the listview.