How do I make a canvas auto grow to fit its content

I am 开发者_JAVA技巧creating a portal type dashboard for our app. The controls are added on the fly. I have a page, with a tabcontrol. In the tab control I add TabItems on the fly with a canvas on it. The canvas handles the mouse events to move the controls around.

I need to allow the users to create a layout bigger than the current size of the tab item... so I inserted a scrollviewer in the tab item and put the canvas onto it. However, the canvas doesn't seem to expand automatically to contain the content.

How can I made the canvas expand to hold all its content within the scroll viewer which will allow me to scroll around the canvas it contains?

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Check these two previous SO posts on how to manipulate the size of a Canvas:

• Force a custom WPF Control to resize correctly
• WPF: How to make canvas auto-resize?