Vista - Alignment vs ContentAlignment

Consider a Window W, Button B, and TextBlock T where

W.Content = B
and
B.Content = T


T may be aligned inside B by setting B.HorizontalContentAlignment and
B.VerticalContentAlignment. However T.HorizontalAlignment and
T.VerticalAlignment have no effect.

B may be aligned inside W by setting B.HorizontalAlignment and
B.VerticalAlignment. W.HorizontalContentAlignment and
W.VerticalContentAlignment have no effect.


Is there a rule that may be deployed to determine whether these
properties should be set on the parent (using
HorizontalContentAlignment and VerticalContentAlignment) or on the
child (using HorizontalAlignment and VerticalAlignment)? It seems a bit
unfair to have to guess. The documentation is not very helpful in this
regard.


{example code follows }

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace AlignmentQuestions {
class MainWindow : Window {

[STAThread]
public static void Main() {
new Application().Run(new MainWindow());
}

public MainWindow() {
Width = 2 * 96; Height = 2 * 96;
Button button = new Button();
TextBlock text_block = new TextBlock(new Run("Button"));
button.Content = text_block;
this.Content = button;

//align text in button
//works
button.VerticalContentAlignment = VerticalAlignment.Top;

//does not work
//text_block.VerticalAlignment = VerticalAlignment.Top;


//align button in window
//does not work
//HorizontalContentAlignment = HorizontalAlignment.Left;

//works
button.HorizontalAlignment = HorizontalAlignment.Left;
}
}
}




--

Martin

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