RibbonButton not aligning properly in Ribbon Control in WPF - wpf

Question

I am creating Ribbon Control for my application and for which I have already written most of code . The only problem I am facing is that the Ribbon Buttons I am adding to the Tabs are not aligning properly in the Tab . As you can see in the Screen Shot the button is aligning to bottom of the Tab. How can I bring these button to top so they are visible.
This is How my app looks like
The XAML Code is below
<UserControl x:Class="SongPurifier.UserControls.RibbonControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:ribbon="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon"
>
<Grid>
<ribbon:Ribbon x:Name="ribbon" VerticalAlignment="Top">
<ribbon:RibbonTab Header="Home">
<ribbon:RibbonSplitButton
Label="Open"
LargeImageSource="/Images/Folder Open.png"
Command="{Binding OpenFolderCommand}">
</ribbon:RibbonSplitButton>
</ribbon:RibbonTab>
<ribbon:RibbonTab Header="Edit" >
<ribbon:RibbonButton Label="Replace String"
LargeImageSource="/Images/Find Replace.png"
Command="{Binding EditSongInfoCommand}"
>
</ribbon:RibbonButton >
<ribbon:RibbonButton Label="Update Song Info"
LargeImageSource="/Images/Update.png"
Command="{Binding UpdateSongInfoCommand}"
>
</ribbon:RibbonButton>
</ribbon:RibbonTab>
<ribbon:RibbonTab Header="Update" >
<ribbon:RibbonButton
Label="Check for Update" >
</ribbon:RibbonButton>
</ribbon:RibbonTab>
</ribbon:Ribbon>
</Grid>

Answer 1

Sachin:
Place your Ribbon Buttons inside a RibbonGroup.
<my:RibbonTab Header="Home">
<my:RibbonGroup Header="File">
<ribbon:RibbonSplitButton
Label="Open"
LargeImageSource="/Images/Folder Open.png"
Command="{Binding OpenFolderCommand}">
</ribbon:RibbonSplitButton>
</my:RibbonGroup>
</my:RibbonTab>