When using the RadToggleSwitchButton and the CheckedContent and UncheckedContent properties are not utilized, in some themes, the on and off states cannot be correctly distinguished. For example, the track or the thumb does not indicate whether the button is checked or not.

Themes, in which this is present are the following ones:

• Material
  
• Office2013
  
• Windows8 and Windows8Touch
  
• OfficeBlack, OfficeBlue, and OfficeSilver 

The UI freezes if the DropDownContent of RadDropDownButton has a native Run element and the CloseOnPopupMouseLeftButtonUp property is set to True.

Add event in RadHyperlinkButton, that allows you to cancel the click action and replace it with custom one. The event can be executed only if the url is invalid, so you can decide if you should leave the default exception that is thrown in this case or if you want to cancel the opening action and implement custom action. 

The RadSplitButton implements the IDisposable interface, but its Dispose method cannot be overridden. Make it protected virtual so its default logic can be extended or replaced when creating a custom button class.

When IsThreeState property is true, after each click values of IsChecked property cycle like this: null -> false -> true. I would like to reverse this order to null -> true -> false in some cases and a property controlling that order would be a great help.

Implement mechanism that allows positioning the drop down content of RadDropDownButton when the DropDownPlacement property is set to Absolute or Relative. Something like DropDownHorizontalOffset and DropDownVerticalOffset.

MouseLeave event is never fired after we change the Them of the controls from a control located in the DropDownContent. Therefor the controls IsMouseOver property is true and looks like it is hovered.

Arg_COMException in some cases when used with RoutedUICommand

Update the Buttons AutomationPeer to use the AutomationProperties attached properties.

As a workaround you can create a custom button control deriving from RadButton. That would allow you to create a custom AutomationPeer class that can return the AutmationProperties.Name value to a narrator application

*  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).

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

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

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

Add Closing event.

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

DropDownButton's DropDownContent blinks when its template and its parent's ControlTemplate are changed at runtime

Add a visual representation for the IsDefault property like in Microsoft's button.

It should be possible to specify whether the drop down should stretch to the width of the button or whether it should be left - right aligned. The same should apply for the vertical positioning when the popup appears left or right of the button.