Grid Control prevents dropdown updates

I have an issue when I use the grid control in my pages that also contain an asp:dropdownlist. If I have the grid on the page, and change the value in the dropdown list, it will not save to the new value I selected. I take the grid off and it updates just fine. Any suggestions as to why I'm experiencing this behavior?

Note: the dropdownlist is NOT in the grid control.

I'm using C#, .Net 2.0, VS 2005 and release 5.102.00.37

Thanks

Afternoon,
I fixed the issue. I placed the datagrid binding in a separate routine and used the Page_Init to determine when to refresh the data. All is well now. I also placed the grid control in a callback panel and checked this.Page.IsPostBack == false && this.Page.IsCallback == false. Now when I select a new item on the dropdownlist, it will properly save to the database instead of defaulting to the first entry in the list.

I know, clear as mud but it works now.