If I put a Grid inside a docked Content control, it doesn't seem to stretch.
It only occupies the size of the child control?
<ContentControl Name="OutputDock" layout:SfDockingManager.Header="Output" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
layout:SfDockingManager.CanClose="False"
layout:SfDockingManager.IsCloseButtonVisible="False"
layout:SfDockingManager.SideInDockedMode="Bottom"
layout:SfDockingManager.DesiredHeightInDockedMode="300">
<Grid Background="Red" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<TextBlock Text="Hi Syncfusion"/>
</Grid>
</ContentControl>