Hey Viv,

Revisiting this topic...

I get how to subclass the control. The question is how do you put a button on the base class?

Thanks


>>I'm trying to create a user control that I can use as a base for other user controls. So created this:
>>
>>

>>public abstract partial class _ViewBase : UserControl
>>{
>>    public _ViewBase()
>>    {
>>        InitializeComponent();
>>    }
>>
>>    public abstract void Add();
>>    public abstract void Edit();
>>    public abstract void Remove();
>>    public abstract void Save();
>>}
>>

>>
>>The I get the comp error:
>>

Partial declarations of 'UserView' must not specify different base classes

>>
>>So I Googled it, found and followed this: http://geekswithblogs.net/lbugnion/archive/2007/03/02/107747.aspx
>>
>>Now I get:
>>
>>

>>"_ViewBase" cannot be the root of a XAML file because it was defined using XAML. 
>>

>>
>>How in the world do you subclass a user control in WPF???
>
>Not sure how the link helps but there's a few things you have to do. Firstly the base class must be defined entirely in C# as a (AFAIK a non-abstract) class so something like :

namespace Junk
>{
>    public class _ViewBase : UserControl
>    {
>        public void Add() { }
>        public void Edit() { }
>        public void Remove() { }
>        public void Save() { }
>    }
>}

To use this in as a subclassed control:

<b:_ViewBase x:Class="Junk.MyViewBase"
>    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
>    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>    xmlns:b="clr-namespace:Junk">
></b:_ViewBase>

with C#:

namespace Junk
>{
>    public partial class MyViewBase : _ViewBase
>    {
>        public MyViewBase()
>        {
>            InitializeComponent();
>        }
>    }
>}

>The first error you got would have been because you didn't sync the base class name between the C# and XAML in the derived class and the second because you tried to create your base class using a XAML component....
>HTH