title: Xamarin Forms Tabbed Page to have overlapping Custom View
body: <p>I need to have something like that with XF Tabbed Page:</p>
  
  <p><a href="https://i.stack.imgur.com/4UcFr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4UcFr.png" alt="enter image description here"></a></p>
  
  <p>I.e., I need some panel which would appear over the whole content (including any tabs) where I can add some custom content. (The reason why I am asking it here, as it wouldn't be an issue in case of common simple page, when I would just have some overlapping view placed on the page).</p>
  
  <p>In functionality it should be something like <code>Action Sheets</code>, but be cross-platform (i.e., defined as common XF view) and include custom content.</p>
  
  <p>But it must be <strong>not necessary custom renderers</strong> with actually <code>Action Sheet</code> implementation (and <code>AlertDialog</code> accordingly to <a href="https://stackoverflow.com/questions/10808608/android-ios-uiactionsheet-equivalent">this</a>). It would be perfect to have some view placed somewhere (I don't know where) in the page layout structure to achieve this.</p>
  
  <p>Or <code>Action Sheet</code> and <code>AlertDialog</code> (with custom renderers) are still the easiest way to have it these days in XF? Thanks!</p>