order in the customkeys

[Pierre-Marie CARETTE]

in the palette property of a control, i create (button new) in the same
custompropertyset several property set keys : k1,k2,k3,k4...

why i have not the same order in the function keys() and when i see the
palette ?

for example : 
creation  k1,k2,k3,l1,l2,l3
i obtain for the customkeys :
k1
l1
k2
k3
l2
l3


I would like to have the same order ....thanks