How Do I Limit the Length of the Displayed Drop Down List of a Combo Box? (Magic xpa 3.x)
Sometimes there can be a lot of choices in a Combo Box. In order to limit how many lines show at one time, you can enter a value in the Visible lines property. In this example, a maximum of 6 lines will show to the user.
The Online and Rich Client Samples projects (program HG13 and RHG13)