Using RadGrid as part of a composite server control

[Daniel]

I am not sure if that will be the right place to ask.
I am writing a asp.net composite server control, which will have a RadGrid as part of it. I don't want to expose the whole grid as a public property though, instead I would like to expose just GridColumnCollection part. 

GridColumnsCollection is a read-only property though so I can't write the code below:

[
    Category("Grid"),
    Description("Columns for a grid."),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
    PersistenceMode(PersistenceMode.InnerProperty)
]
public GridColumnCollection GridColumns
{
    get
    {
        EnsureChildControls();
        return grid.MasterTableView.Columns;
    }
    set
    {
        EnsureChildControls();
        grid.MasterTableView.Columns = value;
    }
}

When I am trying to change it to something like the code below, I will get an error saying that GridColumnCollection does not have constructor which takes 0 arguments.

[
    Category("Grid"),
    Description("Columns for a grid."),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
    PersistenceMode(PersistenceMode.InnerProperty)
]
public GridColumnCollection GridColumns
{
    get
    {
        EnsureChildControls();
        return grid.MasterTableView.Columns;
    }
    set
    {
        EnsureChildControls();
        foreach(GridColumn col in value)
        {
                 grid.MasterTableView.Columns.Add(col);
        }
    }
}

Is there any way to expose just columns from RadGrid as a property of a composite server control?

Thanks,

Daniel

[Daniel]

The topic has been closed as I have found the way to do it (described below).

I fixed it, it seems like I had to set only get{} for the given property:

[
    Category("Grid"),
    Description("Columns for a grid."),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
    PersistenceMode(PersistenceMode.InnerProperty)
]
public GridColumnCollection GridColumns
{
    get
    {
        EnsureChildControls();
        return grid.MasterTableView.Columns;
    }
}

Now when using control I can write:

<c:myGrid>
    <gridColumns>
         (..List of columns like I would normally do with Teleriks RadGrid..)
    </gridColumns>
</c:myGrid>