How to access property into XAML

Take a look at:
StaticResource Markup Extension
[^]

Take a look at Using StaticResources in WPF[^]

Here is an example showing how to do what I think you want to accomplish:
http://stackoverflow.com/questions/896587/wpf-bind-collection-with-collection-to-a-listbox-with-groups[^]

Here is an even simpler answer:
Binding WPF ComboBox to a Custom List[^]

CollectionView supports the notions of a "CurrentItem" and and a "CurrentPosition"

And then there is this technical article from Microsoft:
Windows Presentation Foundation Data Binding: Part 2[^]

Regards
Espen Harlinn

Check out this link, it involves the use ItemsSource :

http://stackoverflow.com/questions/1724180/problem-binding-datagridcomboboxcolumn-itemssource[^]

http://stackoverflow.com/questions/2890156/how-to-bind-collection-to-wpfdatagridcomboboxcolumn[^]

Hi Khaniya,
Actually where is the actual class objects kept.
Suppose your class object is in the user control like

public YourClass CompanyObject
{
get;
set;
} 

and your Datagrid is inside the usercontrol , then you can use like,

<DataGridComboBoxColumn Header="Company" ItemsSource="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}},Path=CompanyObject.GetCompany}" Width="200"></DataGridComboBoxColumn>

Good luck