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Is it possible for a WPF Label to split itself automatically into several lines? In my following example, the text is cropped at the right.
<Window x:Class="..." xmlns="..." xmlns:x="..." Height="300" Width="300">
<Grid>
<Label>
`_Twas brillig, and the slithy toves did gyre and gimble in the wabe:
all mimsy were the borogoves, and the mome raths outgrabe.
</Label>
</Grid>
</Window>
Am I doing something wrong?
Taking other controls is unfortunately not a good option, since I need support of access keys.
Replacing the Label with a TextBlock (having TextWrapping="Wrap"), and adjusting its control template to recognize access keys would be perhaps a solution, but isn't it an overkill?
Edit: having a non-standard style for label will break skinning, so I would like to avoid it, if possible.
203
In WPF, the Label control does not support text wrapping. If you need a label that wraps contents across multiple lines, you can use a TextBlock control. Place a TextBlock control inside a Label and apply wrapping on TextBlock.
XAML attributes of type String may contain any special characters, as long as those are referenced as hex-codes. For example, a simple line break ( \n ) would be represented as 
 , for \r\n you'd use 
 and so on.
Adding Line Breaks Sometimes you will want to insert a line break within a TextBlock. You can do this with a LineBreak inline, added as an XAML element within the text. A new line will be started at the position of this element.
To draw a line, create a Line element. Use its X1 and Y1 properties to set its start point; and use its X2 and Y2 properties to set its end point. Finally, set its Stroke and StrokeThickness because a line without a stroke is invisible. Setting the Fill element for a line has no effect, because a line has no interior.
Using both Label and TextBlock together seems to be the correct answer. There's a howto located here that demonstrates this exact issue.
Specifically, in their example, to get wrapping text and an access key:
<Label Width="200" HorizontalAlignment="Left"
Target="{Binding ElementName=textBox1}">
<AccessText TextWrapping="WrapWithOverflow">
_Another long piece of text that requires text wrapping
goes here.
</AccessText>
</Label>
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