Help for widget UI conversion

Hi,

I'm trying to convert FontTypeDialog into .ui format
However, I get the following error:
warn:vcl.layout:14483:1:include/vcl/builder.hxx:255: .ui widget "variableCB" needs to correspond to 
vcl type 17SmFontPickListBox


what type of GTK should I use ? or How I can fix this error ?

Thank you ..






Best Regards ,
Manal M. Alhassoun
Motah Program, KACST
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