The RadRibbonView control appears to require a minimum height to display, leaving dead whitespace below it, the following does not display the actual ribbon bar:

<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="150" />
<RowDefinition />
</Grid.RowDefinitions>
<telerik:RadRibbonView Grid.Row="0"  >
<telerik:RadRibbonTab Header="Home">
<telerik:RadRibbonGroup Header="Clipboard">
<telerik:RadRibbonSplitButton Text="Paste" 
                    telerik:ScreenTip.Title="Paste(Ctrl+V)"
                    telerik:ScreenTip.Description="Paste the contents the Clipboard.">
<telerik:RadRibbonSplitButton.DropDownContent>
<telerik:RadContextMenu BorderThickness="0">
<telerik:RadMenuItem Header="Paste" />
<telerik:RadMenuItem Header="Paste Form" />
</telerik:RadContextMenu>
</telerik:RadRibbonSplitButton.DropDownContent>
</telerik:RadRibbonSplitButton>
</telerik:RadRibbonGroup>
</telerik:RadRibbonTab>
</telerik:RadRibbonView>


<t:RadDocking Grid.Row="1" x:Name="_docking" PreviewClose="_docking_OnPreviewClose">
<t:RadDocking.DocumentHost>
<t:RadSplitContainer>
<t:RadPaneGroup x:Name="_paneGroup">
</t:RadPaneGroup>
</t:RadSplitContainer>
</t:RadDocking.DocumentHost>
</t:RadDocking>
</Grid>

but if I set the first row definition to 300 then it displays it with about 150px of dead white space below, why does the height of the control not work (incidentally specifying the RadRibbonView controls Height explicitly also does not change anything).  This is on Windows XP  Any ideas?

Hello James,

Indeed the RadRibbonView is automatically collapsed in case its size is under the default threshold of 300x250px. This is a built-in feature of the control that is controlled through the CollapseThresholdSize property - you can use it to change the threshold size to a smaller value. The feature is described in more details in our online documentation.
 
Regards,
Tina Stancheva
the Telerik team