CustomControl ItemsSource binding problem

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C#

Silverlight

custom-controls

Hello,
A bit larger question this time but i hope it's only alot of code and the solution is short, simple and easy and the problem is only becouse of my temporary impairment.

I need to create ItemsSource to my CustomControl. The problem is the control is using to filter records in grid view so in MVVM pattern i need some databindings with various DataContexts.
Here are main parts of code:

View with GridView bounded to certain source:

<base:ViewBase.Resources>
    <observable:DocTypeNames x:Key="DocTypesList" Value="{Binding TypeNamesList}"/>
</base:ViewBase.Resources>

Static resource bounded to List in ViewModel (working fine - can be bounded to any control)

<wfcGrid:WFGridViewDataColumn Width="200" IsSortable="True" DataMemberBinding="{Binding CategoryName}">
    <wfcGrid:WFGridViewDataColumn.Header>
        <TextBlock TextWrapping="Wrap" Text="Kategoria dokumentu"/>
    </wfcGrid:WFGridViewDataColumn.Header>
    <wfcGrid:WFGridViewDataColumn.FilteringControl>
        <filters:ListSelectionFilter NamesList="{Binding Value,Source={StaticResource DocTypesList}}"/>
    </wfcGrid:WFGridViewDataColumn.FilteringControl>
    <wfcGrid:WFGridViewDataColumn.CellTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Margin="5" TextWrapping="Wrap" Text="{Binding CategoryName}"/>
            </StackPanel>
        </DataTemplate>
    </wfcGrid:WFGridViewDataColumn.CellTemplate>
</wfcGrid:WFGridViewDataColumn>

This is a part of GridView template thats why i cannot bind TypeNamesList directly.

The property in ListSelectionFilter control

public List<string> NamesList
{
    get
    {
        return (List<string>)GetValue(NamesListProperty);
    }
    set
    {
        if (itemsList == null)
        {
            itemsList = new List<ListItem>();
        }
        foreach (string s in value)
        {
            if (s != null)
            {
                itemsList.Add(new ListItem()
                {
                    Name = s,
                    Value = false,
                });
            }
        }
        SetValue(NamesListProperty, value);
        listBox.ItemsSource = itemsList;
    }
}

public static readonly DependencyProperty NamesListProperty =
    DependencyProperty.Register(&quot;NamesList&quot;, typeof(List&lt;string&gt;), typeof(ListSelectionFilter), new PropertyMetadata(new List&lt;string&gt;()));

And ObservableObject used as static resource.

public class DocTypeNames : ObservableObject<IEnumerable<string>>
   {
   }

What i know so far is:
- The only thing working iside the template is basic type declared in

<base:ViewBase.Resources>
<sys:String x:Key="Name">Nazwa</sys:String>       
</base:ViewBase.Resources>

When im using something like:

<wfcGrid:WFGridViewDataColumn.FilteringControl>
                                                    <filters:FromDateToDateFilterControl Name="{StaticResource Name}"/>
                                                </wfcGrid:WFGridViewDataColumn.FilteringControl>

Problem is when i'm using "Binding" expression.

- Enumerable Types/Interfaces doesn't matter. Or maybe i didn't found right one.

- Static resource with ObervableObject works fine with other Contexts when im binding for example:

<ComboBox x:Name="docTypeCombo" HorizontalAlignment="Left" Width="150" SelectedValuePath="Tree"
                      DisplayMemberPath="Name" SelectedValue="{Binding Path=DocumentType,Mode=TwoWay}" ItemsSource="{Binding Value,Source={StaticResource DocTypesList}}"
                      />

Combo box is inside DataForm with other DataContext but not in template. When i'm putting ComboBox inside DataForm.EditTemplate - its also working.

In my opinion the thing i'm doing wrong is declaration of ItemsSorce in custom control. Any tutorial i found shows that way but with source bound directly from ViewModel.

I'll be greatfull for any hint how to solve this.