How to Bind Columns Property of a DataGrid Inside a UserControl?

I have a user control with a datagrid inside. I want the caller to be able to do something like this:

<local:MyControl>
    <local:MyControl.GridColumns>
        <DataGridTextColumn Header="Id" />
    </local:MyControl.GridColumns>
</local:MyControl>

I tried to do something like this in my usercontrol definition:

<UserControl ...>
    <DataGrid Colum开发者_JAVA百科ns={Binding GridColumns} />
</UserControl>

I have a GridColumns property in the user control. It does not work.

How to do this correctly?

Thanks.

---

You cannot bind that property as it is not a dependency property, so just forward it:

<DataGrid Name="datagrid" />

public ObservableCollection<DataGridColumn> Columns
{
    get { return datagrid.Columns; }
}