center picture horizontally in menu item of menu grid

I have a grid with cells that look pretty square. And a picture with a transparent background and square shape.

Using the picture on a top-level menu item. The menu control has RowSpan and ColumnSpan of 2 so it too is a square.

But I can't seem to get the picture to move to the right. Stays on the left. Ideally I'd want it to stretch across the 2x2 grid square but I could live with a centered view.

<Menu
	Grid.Row="0" Grid.Column="35" Grid.RowSpan="2" Grid.ColumnSpan="2"
	VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
	VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch"
	Background="Transparent" BorderBrush="Transparent" BorderThickness="0"><MenuItem><MenuItem.Style><Style TargetType="MenuItem"><Setter Property="FontSize" Value="25" /><Setter Property="BorderThickness" Value="0" /><ignore:Setter Property="Height" Value="50" /></Style></MenuItem.Style><MenuItem.Icon ><Image Source="{DynamicResource SettingsButtonImage}" /></MenuItem.Icon><MenuItem.ItemsPanel><ItemsPanelTemplate><VirtualizingStackPanel Orientation="Vertical" /></ItemsPanelTemplate></MenuItem.ItemsPanel><MenuItem Name="menuPreferencesPanel" Header="Preferences"
				  Click="menuPreferencesPanel_Click" /><MenuItem Name="menuTuningPanel" Header="Tuning"
				  Click="menuTuningPanel_Click" /></MenuItem></Menu>

I have 'Height' ignored within the Style so it no longer is affecting the result. Even removed the Style but nothing changed.

Suggestions?