How to create a tree view in uwp xaml

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XAML

UWP

hii guys i have created a treeview but i can't print the content in the tree view and i can't set the background i have used

xmlns:muxc="using:Microsoft.UI.Xaml.Controls"

but no use of it can any one find what mistake i have done

What I have tried:

<TreeView x:Name="treeview" Grid.Row="2" Background="Blue" HorizontalAlignment="Center">
         <TreeView.RootNodes >
             <TreeViewNode Content="colur">
                 <TreeViewNode.Children>
                     <TreeViewNode Content="blue"></TreeViewNode>
                     <TreeViewNode Content="green"></TreeViewNode>
                     <TreeViewNode Content="red"></TreeViewNode>
                 </TreeViewNode.Children>
             </TreeViewNode>
         </TreeView.RootNodes>
     </TreeView>