An updated button that appears and acts like a hyperlink but is really a button with no borders but respects the enabled / disabled and all the visual states. 

 *  link should be disabled / grayed out if not enabled or if command guard is not enabled 
 *  could manage the 'visited' as a pressed (not interested in that for me, I just like the simple visual).
 *  the samples/demos homeview provides a nice example where the long text is highlighted and presents the hand icon. The re-styling is however 6 pages long and cumbersome to copy as it references other parts of the sample project (I tried)

*  3 Image properties (normal, hover, disabled)
 *  showBorder/flat true/false (Essentially making only the image appear as a button)
 *  if the 3 images are not set then the visual state manager should modify the image to appear disabled or hover with a highlight / mask overlay (or whatever the proper term is).

Close the DropDown popup when clicking on the DropDownContent in DropDownButton.

Available in R3 2016 Official Release.

When a RadMenu/RadContextMenu is used as DropDownContent of a SplitButton/DropDownButton, the DropDownContent  cannot be closed after sub menu items are displayed

DropDownButton is leaking.

Implement functionality similar to http://demos.telerik.com/aspnet-ajax/button/examples/togglebutton/defaultcs.aspx

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.