Override MultiSelect List Height
I have a Multi-Select List control on a Custom Dialog with an Extra CSS Class name of "UnusedSerialNosClass". The Size: property of this controlis defined as "Xxlarge", which inpractice turns out to be about 110px.
I need the height of this box to be more like 300px, so I can show enough items in the box at a time to make it useful.
HOW do I override the CSS for this? I tried the following, which makes the overall space occupied by the control 300px, but the box outline and scrollable region is still 100px. See picture.
Here is the CSS Override code I entered in the custom dialog Advanced tab: