iframe for tableau dashboard in tabcontainer tab panel

So I want to display a tableau dashboard in an iframe in a tabcontainer. I got his working fine, but the supporting worksheets in the dashboard keeps expanding in the iframe even when I’ve set the pixel height and width to 1 in the dasboard.   I can only get it to display properly when it is in the default tab in the tabcontainer. I tried this in a groupbox and am seeing the same behavior. The worksheets get expanded when I set the groupbox to (start collapsed).  When I start the groupbox that has the tableau dashboard iframe to (start expanded) the dashboard renders correctly with the dashboard’s supporting worksheets not showing (or showing as a 1x1 pixel view). Anyone have ideas on how to get around this?  I don’t want to have the iframe visible on page load or have to have it always as the default tab.  
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