Hide Show controls in SilverLight Application

hi

I am having a label with the content.

When i click on the edit button, i need to show the text box with the same content in the label.

I can set  the visibility but it takes some space.

I mean here is i placed the text box below the lable.

When i set and change the visibility, the space should be none.

I can say shortly like i need to achieve the property display: none and block in the stack panel in silverlight.

Please let me know if this is not clear.

thanks.