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Editorial Team
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Asked: 2026-05-15T07:54:56+00:00

The book says The WPF Button class only adds two simple concepts on top

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The book says

The WPF Button class only adds two
simple concepts on top of what
ButtonBase already provides: being a
cancel button or a default button.
These two mechanisms are handy short-
cuts for dialogs. If Button.IsCancel
is setto true on a Button inside a
dialog (that is, a Window shown via
its ShowDialog method), the Window is
automatically closed with a
DialogResult of false. If
Button.IsDefault is set to true,
pressing Enter causes the Button to be
clicked unless focus is explicitly
taken away from it.

But in this sample window 

<Window xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
Title="About WPF Unleashed" SizeToContent="WidthAndHeight"
Background="OrangeRed" >
    <StackPanel>
        <Label  FontWeight="Bold" FontSize="20" Foreground="White">
            WPF Unleashed (Version 3.0)
        </Label>
        <Label> 2006 SAMS Publishing</Label>
        <Label>Installed Chapters:</Label>
        <ListBox>
            <ListBoxItem>Chapter 1</ListBoxItem>
            <ListBoxItem>Chapter 2</ListBoxItem>
        </ListBox>
        <TextBox AcceptsReturn="False">HELLO TEXT</TextBox>
        <RadioButton>HELLO RADIO BUTTON</RadioButton>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
            <Button IsCancel="True" MinWidth="75" Margin="10">Cancel</Button>
            <Button x:Name="OKBUTTON" IsDefault="True" MinWidth="75" Margin="10">OK</Button>
        </StackPanel>
        <StatusBar>You have successfully registered this product.</StatusBar>
    </StackPanel>
</Window>

If I press Enter or even click it, the modal Window(By ShowDialog()) does not get closed (leave aside the return value).
Is that an error in the book ?

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1 Answer

  1. Editorial Team

    I believe it is an error. IsDefault and IsCancel simply means that some access-key-magic is applied when the window is created, so that the button is clicked when you hit ‘Enter’ and ‘ESC’ respectively.

    If you want a Window to close – you need to:
    (from MSDN )
    When a dialog box is accepted, it should return a dialog box result of true, which is achieved by setting the DialogResult property when the OK button is clicked
    …
    Note that setting the DialogResult property also causes the window to close automatically, which alleviates the need to explicitly call Close.

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