Add a custom UI gadget to the current container.
Replaced by: hou.CustomPanelContainer
See also: cucd, curm, cuparm
cuadd [-f] -t type
Type can be one of the following:
panel
container
channelchooser
menu
checkbutton
slider
buttonstrip
filechooser
button
label
-f
If the new gadget is a container, automatically make it the new current container.