WPF Expander : Changing expand/collapse arrow position

[sureshvijayan]

hi,

I am using an expander and want to give an expand/collapse look like copy/paste function of windows vista.

when you click on expand button, the arrow position will be pointing downwards. and the expander header flows to bottom and details will be shown above. now the position of expander arrow will be pointing to upwards. when click, the expander header section goes up and expander arrow points downwards.

the same i have tried to do in wpf. now the flow of content and header are fine. but the expander arrow position is opposite to the above functioning.

how we can change the arrow position in expander control property.

for more understanding please find attached image of what i am trying to work out............

thankzzzzzzzzzzz