I have a question regarding a Windows Phone 8.1 Silverlight Project. I would like to use a checkbox in the app. Actually I found an implementation for checkbox in Xlabs, but unfortunately it seems that I am obviously not able to use it properly. When I set in xaml Checked=true then the marker will be displayed well, when checking or unchecking it again. But in default mode or when setting it to false then checking or unchecking won't display the marker in my case. In the Custom Renderer the properties are set accordingly but nothing is displayed. Does anyone have an idea or did anyone mentioned something liek this before? Any hint or advice might be helpful.