Toggle image is not shown when using from Nuget package

[higty]

As title described.

[enisn]

This is just an example, TreeView doesn't include that icon in the nuget package built-in.

• Make sure this check.png is included in your project under Resources/Images path
  https://github.com/enisn/TreeView.Maui/blob/main/sandbox/SandboxTreeView/Resources/Images/check.png
• Make sure you're using datatemplate like in example:

    <t:TreeView ItemsSource="{Binding Nodes}">
                  <t:TreeView.ItemTemplate>
                      <DataTemplate>
                          <HorizontalStackLayout>
                              <HorizontalStackLayout.GestureRecognizers>
                                  <TapGestureRecognizer Command="{Binding ToggleCommand}" />
                              </HorizontalStackLayout.GestureRecognizers>
                              <Image Source="folder.png" IsVisible="{Binding IsDirectory}" HeightRequest="30"/>
                              <Label Text="{Binding Name}"/>
                              <Image Source="check.png" IsVisible="{Binding IsSelected}" HeightRequest="30"/>
                          </HorizontalStackLayout>
                      </DataTemplate>
                  </t:TreeView.ItemTemplate>
              </t:TreeView>

[higty]

Thanks. I'll try.

[enisn]

I think same issue with #11

Can you check again with new version, it should be fixed