Databinding on Composite Control

[Steve]

I'm trying to implement databinding on a composite control and I'm getting an
error with the data when I change the DataSource. The first time I set the
DataSource and call DataBind() everything works fine, but when I set the
DataSource to a new value (DataTable) and then call DataBind again, I get
some strange results from the command events of some embedded ImageButton
controls... althought the data appears to be displayed correctly, the
CommandName and CommandArguemen t values are offset by 1 row. What's worse,
is the error goes away after I post-back a few times (which restores the data
from the ViewState). This is driving me nuts. It seems like the error is
somehow related to the order of operations surrounding the post-back,
EnsureChildCont rols (in OnLoad), and then calling DataBind (which creates the
controls again).

I'm attaching the full class, if anyone is willing to be of service of give
it a look. I would appreciate any help greatly.
//class code start here:

using System;
using System.Data;
using System.Collecti ons;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Componen tModel;
namespace System.Web.UI.W ebControls
{
/// <summary>
/// Summary description for ItemList.
/// </summary>
[DefaultProperty ("Text"),
ToolboxData("<{ 0}:ItemList runat=server></{0}:ItemList>")]
public class ItemList : System.Web.UI.W ebControls.WebC ontrol
{
private bool _isGrid = true;
private DataTable _dataTable = null;
#region public properties/methods/overrides
public ItemList() : base(){}
protected override void OnLoad(EventArg s e)
{
base.OnLoad (e);
if( this.Page.IsPos tBack )
{
EnsureChildCont rols();
}
}
public bool RenderGrid
{
get
{
return _isGrid;
}
set
{
_isGrid = value;
}
}
override public object DataSource
{
set
{
_dataTable = (DataTable)valu e;
ViewState["data"] = value;
}
}
public override void DataBind()
{
CreateControlHi erarchy();
}
protected override void CreateChildCont rols()
{
CreateControlHi erarchy();
}
private void CreateControlHi erarchy()
{
Controls.Clear( );
ClearChildViewS tate();
if( !IsTrackingView State ){ TrackViewState( ); }

if( _isGrid )
{
if( _dataTable == null )
{
CreateItemGrid( (DataTable)View State["data"] );
}
else
{
CreateItemGrid( _dataTable );
}
}
else
{
}

ChildControlsCr eated = true;
}
#endregion

#region CreateItemGrid
private void CreateItemGrid( DataTable dt)
{

Table t = new Table();
t.CssClass = "reportTabl e";

TableRow r = new TableRow();
TableCell cl = new TableCell();

r = new TableRow();
int c = 1;
for( ; c<dt.Columns.Co unt; c++ )
{
r.Cells.Add( AddGridHdrFtrCe ll( dt.Columns[c].ColumnName, true ) );
}
r.Cells.Add( AddGridHdrFtrCe ll( " ", true ) );
r.Cells.Add( AddGridHdrFtrCe ll( " ", true ) );
t.Rows.Add( r );

for( int row=0; row<dt.Rows.Cou nt; row++ )
{
r = new TableRow();
c = 1;
for( ; c<dt.Columns.Co unt; c++ )
{
r.Cells.Add( AddGridDataCell (
dt.Rows[row][dt.Columns[c].ColumnName].ToString(), row ) );
}
r.Cells.Add( AddGridLinkButt onCell( dt.Rows[row]["itmPk"].ToString(),
true, row) );
r.Cells.Add( AddGridLinkButt onCell( dt.Rows[row]["itmPk"].ToString(),
false, row) );
t.Rows.Add( r );
}

r = new TableRow();
cl = new TableCell();
cl.ColumnSpan = dt.Columns.Coun t + 2;
cl.Text = string.Format( "{0} items", dt.Rows.Count );
cl.CssClass = "reportFoot er";
r.Cells.Add( cl );
t.Rows.Add( r );

r = new TableRow();
cl = new TableCell();
cl.ColumnSpan = dt.Columns.Coun t + 2;
cl.Text = " ";
cl.CssClass = "reportItem ";
r.Cells.Add( cl );
t.Rows.Add( r );
this.Controls.A dd( t );
}
private TableCell AddGridHdrFtrCe ll(string text, bool hdr)
{
TableCell c = new TableCell();
c.Text = text;
c.CssClass = hdr ? "reportHead er" : "reportFoot er";
return c;
}
private TableCell AddGridDataCell (string text, int i)
{
TableCell c = new TableCell();
c.Text = text;
c.CssClass = (i+1)%2==0 ? "reportItem " : "reportAltItem" ;
return c;
}
private TableCell AddGridLinkButt onCell(string pk, bool view, int i)
{
ImageButton l = new ImageButton();
l.Visible = visible;
l.CommandArgume nt = pk;
//l.Command += new CommandEventHan dler(ImageButto n_Command);

if( view )
{
l.ImageUrl = "../images/rec_view.gif";
l.AlternateText = "View detail " + pk;
l.CommandName = "view";
}
else
{
l.ImageUrl = "../images/rec_edit.gif";
l.AlternateText = "Edit this item " + pk;
l.CommandName = "edit";
}

TableCell c = new TableCell();
c.Controls.Add( l );
c.CssClass = (i+1)%2==0 ? "reportItem " : "reportAltItem" ;
return c;
}
protected override bool OnBubbleEvent(o bject source, EventArgs ea)
{
bool handled = false;
if( ea is CommandEventArg s )
{
CommandEventArg s e = (CommandEventAr gs)ea;

switch( e.CommandName.T oLower() )
{
case "view":
{
OnRecordAction( new RecordActionEve ntArgs(
e.CommandArgume nt.ToString(), RecordMode.Sele ct ) );
handled = true;
break;
}
case "edit":
{
OnRecordAction( new RecordActionEve ntArgs(
e.CommandArgume nt.ToString(), RecordMode.Upda te ) );
handled = true;
break;
}
}

}

return handled;
}

private void ImageButton_Com mand(object sender, CommandEventArg s e)
{
}
#endregion

}
}