Why won't StackPanel put textblock on left and button on right in Silverlight?

Answer 1

Do you mean that you want the button aligned to the right of the form? If so, StackPanel won't do that. It's made to "stack things up" either horizontally or vertically.

I would suggest you try DockPanel:

<DockPanel>
    <TextBlock x:Name="ProgressIndicator" 
               DockPanel.Dock="Left"
               Text="Ready..." />
    <Button DockPanel.Dock="Right"
            Content="Load Data"
            Width="100"
            Click="Button_Load"
            Margin="0,5,0,0" />
</DockPanel>

Answer 2

I think Matt's approach it the best. Two alternatives though are to use a grid and align the content to the left and right or to just give the button a really large margin.

Answer 3

you could use dockpanel from toolkit or use grid with 2 columns. and have the content of the second column right aligned