<Image Height="40" HorizontalAlignment="Right" VerticalAlignment="Bottom" Width="40" Source="/SilverlightDemo.MainToolbar;Component/Images/i_chart.png" Stretch="Fill" Canvas.Left="222" Canvas.Top="55">                <i:Interaction.Triggers>                        <i:EventTrigger EventName="MouseLeftButtonDown">                                <Actions:ToggleCollapseAction

                            TargetName="HERE:/SilverlightDemo.Modules.TargetModule;Views/TargetModuleView"                             CollapseHorizontal="False"                             CollapseVertical="False"/>                        </i:EventTrigger>                </i:Interaction.Triggers>            </Image>

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After a day or so of working with Silverlight it became quite apparent that you can’t, no you Shouldn’t build Silverlight LOB (Line of Business) applications without Prism.

Prism offers a way to break down your application into modules. And it uses Regions as a way to put it all back together again. Its very similar to the ASP.NET MasterPage/Content area approach.

Unfortunately for me; the control toolkit I’m using (I work for GISi now; its a mapping company…more on that in a future post) is from ESRI but none of the ESRI samples use Prism. When I got down to the nitty gritty I ended up tearing out my hair over my inability to make the map control do two things.

1. Live in a module (a module is a separate project)
2. Take up 100% of the height and width of the shell. – Its a prism term – long post and screencasts coming soon.

I could make the map do 1 or 2 but not 1 and 2…that is until I got some help from @sharpgis

http://forums.esri.com/Thread.asp?c=158&f=2455&t=290394&mc=4

So, the key is to use

 HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"

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