Hello,
Setting 'ZIndex' to a value greather than the component below solved that problem. However, this procedure isn't necessary for 'TIWComboBox'. For that component even if 'ZIndex' is lower than that of the component below it works as expected.
One suggestion for this and other TMS Intraweb components is let the right button (with the down arrow) make it close the content as well. Currently the user has to press the 'ESC' key or click out the component to make it close the items. What do you think? This also is the behavior in 'TIWComboBox' and may confuse the user when she / he uses forms with both components.
Thank you.
Joao Lira.