sd wrote:
> I've created a web control that contains my navigation area. By
> default, I set the visibility of some groups of buttons to be false.
> When a page calls the navigation control, I want to programmatically
> change the visibility for the set of buttons associated with the
> calling page from invisible to visible. For example, when the "Add
> Data" page calls the navigation, the various Add buttons will be
> visible. When the "Search" page calls the navigation, the Add buttons
> will not be visible.
>
> I'm adding the navigation to the target pages by reference (which
> seems to be working fine). Inside the navigation control
> (Navigation.ascx), I have a Web Forms Panel named
> "AddNewIncidentPanel" that contains the buttons I want to see (or
> hide). The aspx page that calls Navigation.ascx uses a placeholder to
> handle the insertion of the navigation area.
>
> In my code-behind page, I've got:
> ---
> Dim NavigationControl As Control = LoadControl("Navigation.ascx")
> NavigationHolder.Controls.Add(NavigationControl)
> AddNewIncidentPanel.Visible = True
> ---
>
> When I run this code, I get the following error:
> ---
> System.NullReferenceException: Object reference not set to an instance
> of an object.
> ---
>
> I've tried a number of Intellisense-suggested options and I'm sure I'm
> overlooking something really obvious, but I'm stuck.
>
> Where have I gone wrong?
>
> Thanks!
>
> Scott