WPF Canvas Ruler Scrollbar issue

Hi,

I want to have ruler always visible even though I have scrollbar visible. See below Images

If I scroll down or scroll to right, both canvas ruler will be disappeared as I am scrolling whole panel to bottom/right. And both rulers are Dock.Left and Dock.To. See this

How can I set both ruler always visible , even though I scroll all the way right to bottom. I can not put scroll bar out side panel, because left ruler needs to move up and down as per vertical scroll and Horizontal ruler need to move left and right as per Horizontal scroll.

Pls Help.

Thanks

Dee