FloatGroup.SizeToContent doesn't work when WindowsFormsHost is used as the root content

Hi Kirill,
If I understood your comments correctly, what you are saying is that essentially SizeToContent does't work with XtraGrid hosted inside a WindowsFormsHost . I wonder why was this marked as fixed in the hotfix.
I'm not sure how this could be achieved anymore. We were overcoming this problem with our Sizing logic inside the xtra grid, to make it size to content - and now the same sizing logic is causing issues while the window is docked.
Thanks for ticket you have raised, will follow up there.
Thanks,
-Thomas

Kirill:"I tested our LayoutPanel's SizetoContent behavior with WindowsFormsHost with XtraGrid and the default WPF Window's SizetoContent behavior with the same control. As you can see in the attached screencast, the behavior is identical"
Please note that this behavior is not exhibited in the following circumstances:

1. A standard WPF Grid hosted inside a floating LayoutPanel could be sized to content
2. A standard WinForms Grid hosted inside a WindowsFormHost, in a floating LayoutPanel could be sized to content.
3. The above 2 points is true with a standard window as well.
   I strongly believe this is an issue cropping up from the XtraGrid implementation (or from the sizing logic which we apply). So the solution, I think still will have to be on the XtraGrid side as this is not a standard WPF behavior.
   Thanks,
   -Thomas

Hi Thomas,

First, let me clarify why this ticket is marked as fixed. After your comment where you posted the following code snippet we have found a general issue in the size-to-content functionality of DXDocking.

XAML
<WindowsFormsHost Background="Yellow" x:Name="Host">  
  <forms:Button Text="Windows Forms control" FlatStyle="Flat"/>  
</WindowsFormsHost>  

Our developers fixed that issue.
In the meantime, I must note that setting SizeToContent for a FloatingGroup is insufficient. It is also necessary to set it for each floating panel you want to resize automatically. Please take a look at the attached screenshot where I demonstrated how a panel with the standard Button is resized in this case.

Regarding the issue with XtraGrid. In order to make sure that it is not related to your custom sizing logic, I have created a clean sample with DXDocking and XtraGrid. The issue occurs there as well.
As it is not related to the issue we fixed in this thread, I have extracted it to a separate ticket - T334097. I am working on it at the moment and will let you know once I have any results.

Also to be clear(and is from the sample posted), we have a floating window(WPF) which has a user control(WPF) having a WindowsFormsHost, hosting an XtraGrid which does't work well with SizetoContent. The SizetoContent works perfectly well when docking is not involved i.e when we have a WPF window with a user control(WPF) as it's content having a WindowsFormhost, hosting an XtraGrid.

I tried a very simple test to see how WindowsformHost works when windows forms controls are hosted in them in relation with SizeToContent.
Here is a sample window which has a user control, with a WindowsFormHost & a Windows Form Button inside it. I'm setting the SizeToContent of the window to Width & Height, which works exactly as I want to be. If I set an explicit height on the button Control, the window re sizes to that height.  This is the kind of behavior we have at the moment, but fails to work with Docking.
<Window x:Class="WpfApplication1.Shell"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation";
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml";
       xmlns:wpfApplication1="clr-namespace:WpfApplication1"
       Title="Shell" SizeToContent="WidthAndHeight">
 <Grid>
   <Grid.RowDefinitions>
     <RowDefinition Height="Auto"></RowDefinition>
     <RowDefinition Height="*"></RowDefinition>
   </Grid.RowDefinitions>
   <StackPanel Orientation="Horizontal" Grid.Row="0">
     <Button Margin="5" Content="Add"/>
     <Button Margin="5" Content="Add"/>
     <Button Margin="5" Content="Add"/>
     <Button Margin="5" Content="Add"/>
     <Button Margin="5" Content="Add"/>
   </StackPanel>
   <wpfApplication1:MainWindow Grid.Row="1"/>
 </Grid>
</Window>
<UserControl x:Class="WpfApplication1.MainWindow"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation";
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml";
       xmlns:forms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms">
 <WindowsFormsHost Background="Yellow" x:Name="Host">
   <forms:Button Text="Windows Forms control" FlatStyle="Flat"/>
 </WindowsFormsHost>
</UserControl>

Hi Thomas,
I have forwarded this ticket to our developers so they see what might go wrong in our SizeToContent implementation. We will update this thread once we have any results.