Make the image inside the buttons to be aware of the FlowDirection.

Add Closing event.

A button with state that looks like a switch.

We have created a SDK sample demonstrates how to style a RadToggleButton to look like a Toggle-Switch button. 
You can find the example in out SDK repository(https://github.com/telerik/xaml-sdk/tree/master/Buttons/ToggleSwitchButton)

Should work the same as the RadContextMenu. 
Also add support for setting effect (DropShadow... ) to the Dropdown itself.