Parameters in Page Header

I am trying to put my parameters in my page header.It do works fine.I am using a textbox to hold the value of my parameters.I use

= Join(Parameters!resourceParams.Label, ", ")

in my textbox expression.But my problem is,when there are too many values specified(because i am using a dropdown with multi select) the page header,overlaps the body of my report. The page header's text overlap the contents of my report body.What could be the reason or work around for this? Thanks guys

Make your text box the maximum height and width you want it to have and than select can grow = false..

If you keep the text left align.. No one will know that its very big.