Thanks for your quickly reply!
It doesn’t work. Because I export as ‘IViewModel’ it is not registered in the display list, when I create it and click ‘Restore Windows’, it will set its position in the unique left ribbon.
I control by ‘SetScreenVisibility’ firstly but it just work after you switch all tab for initialization. When firstly switch tab it will automatcally set Visiblity ‘True’ even set it ‘False’ by code.