message: Shortcuts for zooming
diff: </Style>
  </ResourceDictionary>
  </UserControl.Resources>
  + <UserControl.InputBindings>
  + <KeyBinding Command="{Binding TimelineViewModel.DecreaseScale}" Key="OemMinus" Modifiers="Ctrl"/>
  + <KeyBinding Command="{Binding TimelineViewModel.IncreaseScale}" Key="OemPlus" Modifiers="Ctrl"/>
  + </UserControl.InputBindings>
  <Grid>
  <Grid.RowDefinitions>
  <RowDefinition Height="Auto"/>
  