Add custom control

using MyApp.MyControls;
 
Window "MyApp.MainWindow" {
  MyCustomControl { 
    
  } 
}

or

Window "MyApp.MainWindow" {
  MyApp.MyControls.MyCustomControl { 
    
  } 
}

Fade In element on Loaded event

TextBlock { 
  "Hello, World!"
   
  Style: Style {
    TargetType: TextBlock
    #FadeIn_OnEvent("Loaded")
  }
}

Visibility binded to CheckBox.IsChecked property

TextBlock { 
  "Hello, World!"
   
  Style: Style {
    TargetType: TextBlock
    #Visibility_OnBinding(bind IsChecked from "VisibilityCheckbox", false, "Hidden")  }
}

CheckBox "VisibilityCheckbox" { "Is visible" }

Fade In and Out binded to CheckBox.IsChecked property

TextBlock { 
  "Hello, World!"
   
  Style: Style {
    TargetType: TextBlock
    #Fade_OnBinding(bind IsChecked from "VisibilityCheckbox", true)
  }
}
 
CheckBox "VisibilityCheckbox" { "Is visible" }

Fade on ViewModel property

TextBlock { 
  "Hello, World!"
   
  Style: Style {
    TargetType: TextBlock
    #Fade_OnBinding(bind ShouldBeVisible, true)
  }
}

Animate on Mouse hover

Border "ParentBorder" { 
  Height: 30, Width: 30, Background: LightBlue
 
  Style: Style {
    TargetType: Border
    #DoubleAnimation_PropertyTrigger_Toggle("IsMouseOver", true, "Width", 30, 100, "0:0:0.1")  }
 
  TextBlock { 
    "Hello, World!"
    Margin: 7
 
    Style: Style {
      TargetType: TextBlock
      #Visibility_OnBinding(bind Width from "ParentBorder", 100)
    }
  }  
}