The SplitButton control is a button that can be clicked and also provides a drop down in which you can place any custom content within.
<xctk:SplitButton Content="Click Me">
Properties / Events
| Property || Description|
| Command || Gets/Sets the command to execute when the button is clicked.|
| CommandParameter || Gets/Sets the command parameter to pass to the Command when the button is clicked.|
| CommandTarget || Gets/Sets the element on which to raise the specified command.|
| DropDownContent || Get/Sets the object to use as the drop down button's content.|
| IsOpen || Gets/Sets a value indicating whether or not the drop down is open.|
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| Event || Description|
| Click || Executes when the button is clicked.|
| Closed || Executes when the SplitButton dropdown closes|
| Opened || Executes when the SplitButton dropdown opens|