Vectorlight RichTextBox strange behavior

Vectorlight RichTextBox strange behavior

In my SL5 app i created a a usercontrol with a toolbor and the richtext to manipulate and customize the content of richtextbos.(like here)

I'm using this custom control in a floatable window which is instantiated only one time at starting of my application and i show and close the window.

My first problem is with multi-line content. The first time i show the child it render the content correclty the second time showing the window(with same data) the multi-line content is merged/overlapped in the first one line. The third i show the child it render correctly the fourth time i have same problem and so on.

This is what i get: http://i.stack.imgur.com/24nfe.png

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