WPF Datagrid Combobox

Hey Sandeep,
Thanks for your suggetion. I have tried and it is working fine in a sample application but we are implementing the same concept in MVVM using prism we are unable to bind the data that is what I am trying for.
you can find my sample code below,
.cs
Locations = new List<mylocation> { new MyLocation { Location = "London", NAMEID = 1 }, new MyLocation { Location = "Amsterdam", NAMEID = 2 } };
Persons = new List<Person> { new Person { NAME = "Jack", NAMEID = 1 }, new Person { NAME = "Jill", NAMEID = 2 } };
DataContext = this;

Xaml,
<datagrid autogeneratecolumns="False" name="dgMain" itemssource="{Binding Locations}" canuseraddrows="False">
<datagrid.columns>
<datagridtextcolumn binding="{Binding Location}">
<datagridtemplatecolumn>
<datagridtemplatecolumn.celltemplate>
<datatemplate>
<combobox itemssource="{Binding Persons, RelativeSource={RelativeSource AncestorType=Window}}" displaymemberpath="NAME" selectedvaluepath="NAMEID" selectedvalue="{Binding NAMEID}">

Xaml code is,
<datagrid autogeneratecolumns="False" name="dgMain" itemssource="{Binding Locations}" canuseraddrows="False">
<datagrid.columns>
<datagridtextcolumn binding="{Binding Location}">
<datagridtemplatecolumn>
<datagridtemplatecolumn.celltemplate>
<datatemplate>
<combobox itemssource="{Binding Persons, RelativeSource={RelativeSource AncestorType=Window}}" displaymemberpath="NAME" selectedvaluepath="NAMEID" selectedvalue="{Binding NAMEID}">