How do I get this listbox to be maxiumum size, i.e. fill the group box its in. I ve tried width="auto" Height="auto", width="stretch" Height="stretch"
annoyingly at the moment, it dynamicly sizes to whatever fills it - (i cant think of any situation you d want a listbox to do that but anyway) - or I can only statically set its size.
Cheers!
The problem is that StackPanels try to take up as little space as possible.
Just remove them and you should be fine.
<GroupBox>
<ListBox />
</GroupBox>
If that doesn t fit your situation, we ll need a bit more context on where the ListBox is going.
DockPanels are also good for making controls use up the remaining space. The last item inside a DockPanel uses all the remaining space (as long as you haven t set LastChildFill = false).
The below example allows the TextBlock to take up as much space as it needs at the top, and then the GroupBox with the ListView takes up the rest.
<DockPanel>
<TextBlock DockPanel.Dock="Top" Text="My TextBlock Text" />
<GroupBox>
<ListBox />
</GroupBox>
</DockPanel>
If you want sizing to fill, you should be using Grids not StackPanels.
<Grid>
<GroupBox>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<ListBox />
</Grid>
</GroupBox>
</Grid>
If you really want StackPanels, you can use HorizontalContentAlignment="Stretch" and VerticalContentAlignment="Stretch" on the StackPanel.
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