Multi Line Support in WPF Dropdown Button (DropDownButtonAdv)
The label displayed in the button can be a line or two, when the property IsMultiLine is set to true. The default value is true.
Multiline support can be enabled by using the following code:
<sync:DropDownButtonAdv SizeMode="Large" IsMultiLine="False"/>
This property only applicable for Large Size Mode Buttons.