crown-engine/samples/res/editor_mainwindow.xml

<Window Name="mainWindow" Title="Main Window" DesiredSize="90, 80">
  <StackLayout Orientation="Vertical">
    <Button Name="btnNewLibrary" Margins="0,0,0,1" OnClick="{Action NewLibrary}">
      <Label Text="New Library" HorizontalTextAlign="Center" />
    </Button>
	<Button Name="btnOpenLibrary" Margins="0,1,0,1" OnClick="{Action OpenLibrary}">
      <Label Text="Open Library" HorizontalTextAlign="Center" />
    </Button>
    <Button Name="btnClose" Margins="0,1,0,0" OnClick="{Action QuitApplication}">
      <Label Text="Close" HorizontalTextAlign="Center" />
    </Button>
  </StackLayout>
</Window>