Q:

Dividing WPF window

I want to divide my window (wpf) in three columns: left column must be DockPanel ( I think StackPanel will not work on Canvas), the right column should be another DockPanel holding a listbox and in the middle I need to have a Canvas.
This is what I have done and I am having problem with left column since it is not expandable. I need the left column as holder of custom object so that user could drag/drop them on canvas. Please advise.
<DockPanel LastChildFill="True" Background="LightGray" Margin="5">
   <Expander Header="Controls" Background="Gray" Margin="2" 
             Content="{StaticResource FC}" DockPanel.Dock="Top" 
             IsExpanded="True" Width="200" />
</DockPanel>

<GridSplitter Focusable="False" Width="2" Background="LightGray"
              VerticalAlignment="Stretch" HorizontalAlignment="Right"/>

<lib:MyCanvas x:Name="myCanvas" FlowDirection="LeftToRight"  
         Background="White" AllowDrop="True" 
         Mouse.MouseMove="MyCanvas _MouseMove">
</lib:MyCanvas >

Also, what control should be used on the right side so that can hold a listbox?      

A:

Looking at various question you have asked, it looks like you are looking at building an application similar to Visual studio. I would suggest you to look at following great series of articles on CodeProject similar to your requirement i.e. having ToolBox, various ToolBox items , a designer, drag & drop items on designer etc. -
WPF Diagram Designer - Part 4, Part 3, Part 2, Part 1
You will just have to add a PropertyGrid on the right side and bind your selected ToolBox item in designer with it.

