Hi guys, i'm with one strange problem.

I am extending a control from a Gridview, and adding a dropdown to paging to the page i want.

In my custom gridview i added a ITemplate than contains 4 image buttons and one dropdownlist

(4 images - 1st, prev, next, last) (1 ddl - to page)

and add him to my custom gridview..

I added a selectindexchange event to dropdown, to fire when a index is changed

The problem is:

The first time i load the page with my control it is really ok.. but when i change index, in debug i see to run constructor of control, creating footer template, and guess..

the method of indexchange isn't fired and returns an exception saying:

Unable to cast object of type 'System.Web.UI.WebControls.ImageButton' to type 'System.Web.UI.WebControls.Table'.

[InvalidCastException: Unable to cast object of type 'System.Web.UI.WebControls.ImageButton' to type 'System.Web.UI.WebControls.Table'.]
   System.Web.UI.WebControls.GridView.PrepareControlHierarchy() +122
   System.Web.UI.WebControls.GridView.Render(HtmlTextWriter writer, Boolean renderPanel) +50
   System.Web.UI.WebControls.GridView.Render(HtmlTextWriter writer) +33
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10

...

apreciate for the help, thanks