Possible to show only one Toolbarrow?

Hi there!

My customer wants to have only one row of the toolbar shown until he klicks on the arrow to show the full toolbar.

Now when you klick the little arrow on the right side, the button calls function 70, wich makes "toolbar.hide" and that sets the toolbar to "display:none"

here is the code:

hide : function()
{
this.setStyle( 'display', 'none' );
},

Is there a known possibility to set it only to one row?