When having the following setup:
<telerik:RadExpander x:Name="expander">
and the style is defined as follow:
<Style x:Key="stdRadExpanderHeader" TargetType="telerik:ExpanderHeader">it works with 7.1.0 version
RadExpander controls is rendering too slow in mac debug mode
When changing the view, it takes a lot of time to render the interface after the constructor is executed