C#

[DefaultProperty("Text")]
[ParseChildren(true), PersistChildren(false)]
        
public class MyGrid : GridView
{        
    //... Some variable declarations

    protected SizeItemCollection _PageSizeItems;
    [Category("Paging")]        
    [Editor(typeof(CollectionEditor), typeof(System.Drawing.Design.UITypeEditor))]
    [PersistenceMode(PersistenceMode.InnerDefaultProperty), MergableProperty(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    [Description("Items list for the PageSize selector DropDownList")]
    public SizeItemCollection PageSizeItems
    {
        get
        {
            return (_PageSizeItems != null ? _PageSizeItems : new SizeItemCollection());
        }
    }
    protected override void InitializePager(GridViewRow row, int columnSpan, PagedDataSource pagedDataSource)
    {
        //Here I create the pager row and added the DropDownList with the values in PageSiZeItems
    }
	
    //... some more code ...
        
}

public class SizeItem : Component
{
    private int _size;
    public SizeItem() { }
    public SizeItem(int size)
    {
        _size = size;
    }
    public int Size
    {
        get { return _size; }
        set { _size = value; }
    }             
}

public class SizeItemCollection : CollectionBase
{
    //Here I implemented Add(), Insert(), Remove(), Contains(), IndexOf() and CopyTo()
    //for my SizeItem class
}