And as far as I know, Xpad works only with GTK3, since it uses many features which are GTK3 only.
So for simplicity I suggest to stick with GTK3 only, unless you have reasons to support GTK2.
And as far as I know, Xpad works only with GTK3, since it uses many features which are GTK3 only.
So for simplicity I suggest to stick with GTK3 only, unless you have reasons to support GTK2.